delivered the opinion of the Court.

In 1928, Mountain States Telephone and Telegraph Company purchased an easement from the Pueblo of Santa Ana for a telephone line. Mountain States contends that the conveyance of this easement was valid under §17 of the Pueblo Lands Act of 1924, 43 Stat. 641, because it was “first approved by the Secretary of the Interior.”1 The Pueblo contends that §17 only authorizes such transfers “as may hereafter be provided by Congress,” and that Congress never provided legislation authorizing the conveyance of Pueblo lands with the approval of the Secretary. Both constructions find some support in the language of § 17.

*240I — I

Congress enacted the 1924 legislation “to provide for the final adjudication and settlement of a very complicated and difficult series of conflicting titles affecting lands claimed by the Pueblo Indians of New Mexico.”2 The Committee Reports review the unique and “interesting history of the Pueblo Indians”3 and explain why special remedial legislation was necessary.

“These Indians were found by Coronado and the first Spanish explorers in 1541, many of them residing in villages and occupying the same lands that the Pueblo Indians now occupy.”4 From the earliest days, the Spanish conquerors recognized the Pueblos’ rights in the lands that they still occupy,5 and their ownership of these lands was confirmed in land grants from the King of Spain. Later, the independent Government of Mexico extended limited civil and political rights to the Pueblo Indians, and confirmed them in the ownership of their lands.

The United States acquired the territory that is now New Mexico in 1848 under the Treaty of Guadalupe-Hidalgo.6 During the period between 1848 and 1910, when New Mexico became a State, inhabitants of that territory — and members of the bar who advised them — generally believed that the Pueblo Indians had the same unrestricted power to dispose of their lands as non-Indians whose title had originated in Spanish grants. This view was supported by decisions of the *241Supreme Court of the Territory of New Mexico,7 and by this Court’s square holding in United States v. Joseph, 94 U. S. 614 (1877),8 that the Pueblo Indians were not an “Indian tribe” protected by the Nonintercourse Act.9 As a result, it *242was thought that the Pueblo Indians could convey good title to their lands notwithstanding the Act’s prohibition of any “purchase, grant, lease, or other conveyance of lands . . . from any . . . tribe of Indians.” 4 Stat. 730, 25 U. S. C. §177.

The prevailing opinion concerning the unique status of the Pueblo Indians was drawn into question as a result of the attempt by federal authorities to regulate the liquor trade with the Pueblos. They orginally brought charges under an 1897 criminal statute prohibiting the sale of liquor to any “Indian.”10 Relying on Joseph, however, the Territorial Supreme Court held, in 1907, that the Pueblos were not “Indians” within the meaning of the statute.11 In response, the New Mexico Enabling Act of 1910 expressly required that the new State’s Constitution prohibit “the introduction of liquors into Indian country, which term shall also include all lands now owned or occupied by the Pueblo Indians of New Mexico.”12 In United States v. Sandoval, 231 U. S. 28 (1913), the Court noted that whatever doubts there previously were about the applicability of the Indian liquor statute to the Pueblos, “Congress, evidently wishing to make sure of a different result in the future, expressly declared” in the Enabling Act that “it should include them.” 231 U. S., at 38.

The narrow question decided in the Sandoval case was that the dependent status of the Pueblo Indians was such that Congress could expressly prohibit the introduction of intoxicating liquors into their lands under its power “To regulate Commerce . . . with the Indian Tribes.” U. S. Const., Art. I, § 8, cl. 3. In reaching that decision, however, the Court *243rejected the factual premises that had supported its judgment in Joseph,13 and suggested that “the observations there made respecting the Pueblos were evidently based upon statements in the opinion of the territorial court, then under review, which are at variance with other recognized sources of information, now available, and with the long-continued action of the legislative and executive departments.” 231 U. S., at 49. The Court’s disapproval of Joseph strongly implied that the restraints on alienation contained in the Nonintercourse Act — as well as the liquor statute — might apply to the Pueblos. As a result, the validity of all non-Indian claims to Pueblo lands was placed in serious doubt.

Relying on the rule established in Joseph, 3,000 non-Indians had acquired putative ownership of parcels of real estate located inside the boundaries of the Pueblo land grants.14 The Court’s decision in Sandoval cast a pall over all these titles by suggesting that the Pueblos had been wrongfully dispossessed of their lands, and that they might have the power to eject the non-Indian settlers.15 After *244conducting extensive hearings on the problem,16 Congress drafted and enacted the Pueblo Lands Act of 1924. The stated purpose of the Act was to “settle the complicated questions of title and to secure for the Indians all of the lands to which they are equitably entitled.” S. Rep. No. 492, 68th Cong., 1st Sess., 5 (1924).

II

Under the Act, a Public Lands Board, composed of the Secretary of the Interior, the Attorney General, and a third person to be appointed by the President of the United States, was established to determine conflicting claims to the Pueblo lands. § 2, 43 Stat. 636. The Board was instructed to issue a report setting forth the metes and bounds of the lands of each Pueblo that were found not to be extinguished under the rules established in the Act. Ibid. Continuous, open, and notorious adverse possession by non-Indian claimants, coupled with the payment of taxes from 1889 to the date of enactment in 1924, or from 1902 to 1924 if possession was under color of title, sufficed to extinguish a Pueblo’s title. §4.17 *245The Board’s reports were to be implemented by suits to quiet title in the United States District Court for the District of New Mexico. §§ 1, 3.

The Act also directed the Board to award the Pueblos compensation for the value of any rights that were extinguished if they “could have been at any time recovered for said Indians by the United States by seasonable prosecution.” §6. Settlers who had occupied their lands in good faith, but whose claims were rejected, might receive compensation for the value of any improvements they had erected on their lands, or for the full value of their lands if they had purchased those lands and entered them before 1912 under a deed purporting to convey title. §§ 7, 15.

After the Board determined who owned each parcel of land, the Act foresaw that some consolidation of each Pueblo’s land holdings might occur. The Board was directed to identify any parcels adjacent to a Pueblo settlement that should be purchased from non-Indian owners for transfer to the Pueblo. §8. In addition, §16 of the Act authorized the Secretary of the Interior, with consent of the Pueblo, to sell any lands owned by the Pueblo that were “situate among lands adjudicated or otherwise determined in favor of non-*246Indian claimants and apart from the main body of the Indian land.”18

The foregoing provisions of the Pueblo Lands Act were all designed to settle the consequences of past transactions. In contrast, the section we must construe in this case — § 17— was entirely concerned with transactions in Pueblo lands that might occur in the future. It provides:

“No right, title, or interest in or to the lands of the Pueblo Indians of New Mexico to which their title has not been extinguished as hereinbefore determined shall hereafter be acquired or initiated by virtue of the laws of the State of New Mexico, or in any other manner except as may hereafter be provided by Congress, and no sale, grant, lease of any character, or other conveyance of lands, or any title or claim thereto, made by any pueblo as a community, or any Pueblo Indian living in a community of Pueblo Indians, in the State of New Mexico, shall be of any validity in law or in equity unless the same be first approved by the Secretary of the Interior.” 43 Stat. 641-642 (emphasis added).

*247The question to be decided here is whether the second clause — the language following the word “and” — indicates that a Pueblo may convey good title to its lands with the approval of the Secretary of the Interior.

I — I J-H HH

In 1905 Mountain States’ predecessor allegedly acquired a right-of-way and constructed a telephone line across land owned by the Pueblo of Santa Ana. App. 8. Presumably the 1905 conveyance would have been invalid under the Non-intercourse Act. See n. 17, swpra. In all events, in 1927 the United States, acting as guardian for the Pueblo of Santa Ana, brought an action in the United States District Court for the District of New Mexico to quiet title to the lands of that Pueblo.

While the litigation was pending, the Pueblo entered into a right-of-way agreement with Mountain States granting it an easement “to construct, maintain and operate a telephone and telegraph pole line” on the land now in dispute. App. 39.19 The agreement was forwarded to the Secretary of the Interior by the Bureau of Indian Affairs with the recommendation that it be approved under § 17. Id., at 181-183. This agreement was approved, and the approval was received, and endorsed on the right-of-way agreement. Id., at 43. On the Government’s motion,20 id., at 36, the District Court thereafter dismissed Mountain States from the quiet title *248action on the ground that it had “secured good and sufficient title to the right of way and premises in controversy ... in accordance with the provisions of Section 17 of the Pueblo Lands Act.”21

Mountain States removed the telephone line in 1980. On October 10 of that year, the Pueblo brought this action claiming trespass damages for the period prior to the removal of the line. The District Court granted partial summary judgment for the Pueblo on the issue of liability, holding that the grant of the right-of-way in 1928 was not authorized by § 17. Id., at 86-92.

The Court of Appeals allowed an interlocutory appeal under 28 U. S. C. § 1292(b) and affirmed. 734 F. 2d. 1402 (CA10 1984). The court held that Pueblo lands were protected by the Nonintercourse Act prior to 1924 and that § 17 of the Pueblo Lands Act did not authorize any conveyance of such lands. It reasoned:

“The two clauses of § 17 of the Pueblo Lands Act are joined by the conjunctive ‘and.’ To us that means exactly what it says. No alienation of the Pueblo lands shall be made ‘except as may hereafter be provided by Congress’ and no such conveyance ‘shall be of any validity in law or in equity unless the same be first approved by the Secretary of the Interior.’ Two things are required. First, the lands must be conveyed in a manner provided by Congress. Second, the Secretary of the Interior must approve. As to the first, at the time of the agreement between the Pueblo and [Mountain States], Congress had provided nothing. Hence, the first condition was not met. The fact that Congress had provided *249no method makes the approval of the Secretary meaningless. The operation of the second clause depends on compliance with the first clause.” Id., at 1406.

The Court of Appeals considered and rejected Mountain States’ reliance on the legislative history of the 1924 Act and its construction by the Secretary of the Interior.

Our concern that the Court of Appeals’ interpretation of the Act might have a significant effect on other titles acquired pursuant to § 17 led us to grant certiorari. 469 U. S. 879 (1984). We now reverse.

HH <

The word “hereafter” in the first clause of § 17 supports the Court of Appeals’ interpretation of the Act. Read literally, the statute seems to state unequivocally that no interest in Pueblo lands can be acquired “except as may hereafter be provided by Congress” — or, stated somewhat differently, until Congress enacts yet another statute concerning the lands of the Pueblo Indians of New Mexico.

The problem with this construction of the statute is that the requirement of the Secretary’s approval in the second clause of § 17 would be a nullity until Congress acts. Even if a later Congress did enact another statute authorizing the alienation of Pueblo lands, that Congress would be entirely free to accept or reject that requirement. Neither the Pueblo nor the Court of Appeals has offered any plausible reason for attributing this futile design to the 68th Congress. In light of “the elementary canon of construction that a statute should be interpreted so as not to render one part inoperative,” Colautti v. Franklin, 439 U. S. 379, 392 (1979), the second clause of § 17 cannot be read as limiting the power of Congress to legislate in the “hereafter.”22

*250The Court of Appeals’ literal interpretation of the first clause of § 17 would also nullify the effect of § 16. See n. 18, supra. The design of the Pueblo Lands Act indicates that Congress thought some consolidation of Pueblo land holdings might be desirable in connection with the claims settlement program to be promptly implemented by the Pueblo Lands Board. See supra, at 245-246. To this end, § 16 purports to authorize conveyances of Pueblo lands with the consent of the governing authorities of the Pueblo and the approval of the Secretary of the Interior. If the Court of Appeals’ literal construction of § 17 were accepted, the consolidation of properties foreseen by § 16 could have been implemented only as Congress might thereafter provide. It is inconceivable that Congress would have inserted § 16 in the comprehensive settlement scheme provided in the Act if it did not expect it to be effective forthwith.

Finally, the practical effect of the Court of Appeals’ interpretation is to apply the requirements of the Nonintercourse Act to voluntary transfers of Pueblo lands. In 1924, Congress logically could have adopted any of three approaches to voluntary transfers. It could have left the matter to be decided by the courts; applied the rule of the Nonintercourse Act; or adopted a new rule of law. A review of the structure of the statute convinces us that Congress followed the last course.

In arguing that § 17 simply extended the provisions of the Nonintercourse Act to the Pueblos, the Pueblo relies on language in the first clause of the section. However, it is the second — not the first — clause of § 17 that closely resembles the language and structure of the Nonintercourse Act:

Section 17:

“[N]o sale, grant, lease of any character, or other conveyance of lands, or any title or claim thereto, made by any *251pueblo as a community, or any Pueblo Indian living in a community of Pueblo Indians, in the State of New Mexico, shall be of any validity in law or in equity unless the same be first approved by the Secretary of the Interior.” Nonintercourse Act:

“[N]o purchase, grant, lease, or other conveyance of lands, or of any title or claim thereto, from any Indian nation or tribe of Indians, shall be of any validity in law or equity, unless the same be made by treaty or convention entered into pursuant to the Constitution.”

The language is slightly — but significantly — altered to provide for approval by the Secretary of the Interior instead of ratification by Congress.

In any case, if Congress had intended to apply the Nonin-tercourse Act to these lands, it is difficult to understand why it did not say so in simple language. When Congress considered it appropriate in the Act to extend generally applicable Indian statutes to the Pueblos it did so with concise language directed to that end.23 Indeed, in view of subsequent events, Congress might have achieved that result simply by omitting § 17 from the Act and leaving the matter to the courts. See n. 17, supra. In our view, it is much more likely that Congress intended to authorize a different procedure for Pueblo lands in view of their unique history — a history that is discussed at some length in the Committee Reports.24

*252V

There is another reading of the statute that better harmonizes the two clauses of § 17 with the structure of the entire Act and with “its contemporary legal context.”25 After the Joseph decision, it was generally assumed that questions of title to Pueblo lands were to be answered by reference to New Mexico law, rather than to federal law. In 1924, Congress was legislating without the benefit of a clear holding from this Court that the Pueblos had been completely assimilated to the status of Indian tribes whose land titles were protected by federal law. Sandoval had established that the Indian liquor law applied to the Tribe, and had strongly implied that the Nonintercourse Act would also apply; but Congress surely wanted to make clear that state law, for the future, was entirely pre-empted in this area, and that Congress had assumed complete jurisdiction over these lands. The first clause of §17 is fairly read as a flat prohibition against reliance on New Mexico law in connection with future transactions involving Pueblo lands. After 1924, alienation of those lands, voluntary or involuntary, was only to occur if sanctioned by federal law.

While the first clause of § 17 refers generally to the acquisition of any “right, title, or interest in . . . lands of the Pueblo Indians,” the second clause refers to any “sale, grant, lease ... or other conveyance of lands.” This language plainly refers to transfers of land freely made by a Pueblo. The second clause of § 17 is logically interpreted as providing a firm command, as a matter of federal law, that no future conveyance should be valid without the approval of the Secretary of the Interior. The language suggests that Congress assumed that the Secretary of the Interior could adequately protect the interests of the Pueblos in connection with future land transactions. This construction is supported by the language of § 16 allowing for the consolidation of Pueblo lands *253with the consent of the Pueblo and if “the Secretary of the Interior deems it to be for the best interest of the Indians.”26

This interpretation of §17 gives both clauses a meaning that is consistent with the remainder of the statute and with the historical situation of the Pueblos.27 It is consistent with the limited legislative history available,28 and is supported by *254the contemporaneous opinion of the Secretary of the Interior and the Federal District Judge who placed a stamp of approval on this transaction and numerous others in the years following the enactment of the Pueblo Lands Act in 1924.29 The uniform contemporaneous view of the Executive Officer responsible for administering the statute and the District Court with exclusive jurisdiction over the quiet title actions brought under the Pueblo Lands Act30 “is entitled to very great respect.”31 These individuals were far more likely to *255have had an understanding of the actual intent of Congress than judges who must consider the legal implications of the transaction over half a century after it occurred.

The judgment of the Court of Appeals is reversed.

It is so ordered.

dissenting.

Section 17 of the Pueblo Lands Act of 1924, 43 Stat. 641-642, provides in full:

“No right, title, or interest in or to the lands of the Pueblo Indians of New Mexico to which their title has not been extinguished as hereinbefore determined shall hereafter be acquired or initiated by virtue of the laws of the State of New Mexico, or in any other manner except as may hereafter be provided by Congress, and no sale, grant, lease of any character, or other conveyance of lands, or any title or claim thereto, made by any pueblo as a community, or any Pueblo Indian living in a community of Pueblo Indians, in the State of New Mexico, shall be of any validity in law or in equity unless the same be first approved by the Secretary of the Interior.”

This awkward and obscure provision is a striking illustration of the fact that statutory phraseology sometimes is “the consequence of a legislative accident, perhaps caused by nothing more than the unfortunate fact that Congress is too busy to do all of its work as carefully as it should.” Delaware Tribal Business Committee v. Weeks, 430 U. S. 73, 97 (1977) (Stevens, J., dissenting) (emphasis added). Section 17’s opaque language has given rise to not just two conflicting interpretations, but to literally a multitude of proffered readings— each of which attempts to rationalize the ambiguous words, phrases, and clauses and to explain away apparently incon*256sistent or inoperative language, and each of which ultimately fails to meld the language into a coherent whole.1 This muddle is perhaps best illustrated by the fluctuating construction given to § 17 by the Department of the Interior over the past 60 years. See infra, at 270-275. And while the Court offers up its own attempt to “harmoniz[e]” the anomalies of § 17, ante, at 252, it must ultimately concede that some aspects of § 17 “remaifn] a puzzle even under [its] interpretation,” ante, at 253, n. 27.

I would have thought that the Court, in attempting to drain this statutory bog, would turn naturally to the canons of construction that have governed Indian-law questions for the past two centuries — canons designed specifically to resolve ambiguities in construing provisions such as § 17, and which grow directly out of the federal trust responsibilities that define the conduct of Congress, executive officials, and the courts with respect to Indian tribes.2 Instead, the Court wholly ignores these canons and boldly pronounces its own revisionist interpretation of the statute that goes far beyond even the Government’s current reading. Under the Court’s view, Congress intended by § 17 to give the 19 Pueblo Tribes a power possessed by no other Indian tribe — the power to alienate their unalloted tribal lands freely without any restrictions, subject only to the approval of the Secretary of the Interior, and without any guidelines respecting the *257manner, scope, requirements, or timing of the Secretary’s supervision.

I dissent. I believe § 17 more plausibly is read simply as an attempt by Congress to reaffirm and clarify the full applicability to the Pueblo Tribes of general federal restraints against alienation of Indian lands and the exceptions thereto. This interpretation better reflects the structure of the Pueblo Lands Act and the spirit in which it was enacted. The Court’s interpretation, on the other hand, flies in the face of both the Pueblo Lands Act and of legislation enacted prior to and after the Act; misconstrues the legislative history; overlooks evidence concerning the origins and consistency of the administrative interpretation to which the Court now purports to defer; and flouts the fiduciary relationship owed to Indian tribes and the canons of construction that serve to preserve that relationship.

I

As the Court acknowledges, § 17 must be examined in light of “ ‘its contemporary legal context.’ ” Ante, at 252. Alienation of Indian lands, in 1924 as now, was governed by the principles of the Nonintercourse Act, which provides that “[n]o purchase, grant, lease, or other conveyance of lands, or of any title or claim thereto, from any Indian nation or tribe of Indians, shall be of any validity in law or equity, unless the same be made by treaty or convention entered into pursuant to the Constitution.”3 Congress ceased entering into treaties with Indian tribes in 1871,4 but the Nonintercourse Act has continued to define the essential characteristics of Indian title in this country: that all questions concerning Indian property are pre-empted by federal law, and that interests in *258Indian lands can be conveyed only pursuant to explicit congressional authorization.5

Since 1871, Congress has permitted interests in unallotted Indian lands to be conveyed in two ways: first, through specific statutes authorizing alienation of particular tribal lands; and second, through general statutes authorizing the transfer of limited interests in Indian lands subject to the approval of the Secretary of the Interior.6 A number of statutes in this second category were enacted at the end of the 19th century and early in the 20th century, and authorized such limited conveyances as leases for farming, grazing, and oil, gas, and mineral development; rights-of-way for highways, railways, and utilities; and sales of timber.7 These statutes typically placed strict limits on the Secretary’s authority by, inter alia, prescribing the price and term of years for which interests could be conveyed, providing for the collection of special taxes and royalties for the benefit of the affected tribes, placing restrictions on the geographic scope of conveyances, establishing procedural safeguards for the tribal owners, and requiring the promulgation of rules and regulations by which the Secretary would exercise his authority.

*259Congress had extended the Nonintercourse Act to the Territory of New Mexico in 1851,8 but from shortly after the Civil War until 1910, the territorial courts, sustained by this Court, barred application of the Act to the Pueblos on the grounds that they were not really “Indians.” See, e. g., United States v. Joseph, 94 U. S. 614 (1877); United States v. Lucero, 1 N. M. 422 (1869). As the Court subsequently conceded, however, this interpretation was erroneous: with respect to “the status of the Pueblo Indians and their lands,” the Pueblos always have been “Indians in race, customs, and domestic government” and “like reservation Indians in general.” United States v. Sandoval, 231 U. S. 28, 38-39, 41 (1913). Accordingly, the Court has repeatedly reaffirmed that the Pueblos have the same status as all other federally recognized Indian tribes and that the 1851 Act clearly and fully extended the Nonintercourse Act to them.9

In order to reassert its authority over the Pueblos, Congress in the New Mexico Enabling Act of June 20, 1910, provided as a condition for statehood that “all lands ... owned or held by any Indian or Indian tribes . . . shall be and remain subject to the . . . absolute jurisdiction and control of the Congress of the United States,” and that “the terms ‘Indian’ and ‘Indian country’ shall include the Pueblo Indians of New Mexico and the lands now owned or occupied by them.”10 *260After the Enabling Act and the Court’s decision in Sandoval, the Department of the Interior began to supervise leasing and grants of rights-of-way pursuant to the statutes summarized above. Numerous such conveyances were subjected to its supervision between 1910 and the enactment of the Pueblo Lands Act in 1924,11 and during its consideration of the 1924 Act Congress was informed that the leasing and right-of-way statutes were being applied to the Pueblos “to the same extent” as other Indian tribes.12

The first 16 sections of the Pueblo Lands Act set forth a comprehensive mechanism for resolving the thousands of disputed land claims that resulted from the Pueblos’ uncertain status after the Court’s decision in Joseph and prior to the *261enactment of the Enabling Act and the decision in Sandoval. See ante, at 244-246. I believe that § 17 — described by its author as “the shortest way to prevent existing conditions from recurring or existing again”13 — is best read simply as a declaratory reaffirmation of the full applicability to the Pueblos of the Nonintercourse Act as it stood in 1924. Thus, the first clause of § 17 — prohibiting the acquisition of Pueblo title under New Mexico law or in “any other manner” except as provided by Congress — served merely to reaffirm the federal pre-emption of all questions concerning Pueblo lands. The second clause of § 17 — prohibiting any form of “conveyance . . . unless the same be first approved by the Secretary of the Interior” — can quite similarly be read as merely confirming that conveyances of interests in Pueblo lands must have secretarial approval — where Congress otherwise has created a mechanism for the Secretary to approve particular conveyances.

This reading does, of course, render §17 redundant of then-existing law. But as the Court repeatedly has acknowledged, Congress’ historical practice in Indian-law enactments frequently has been to include such general policy declarations and reaffirmations of the status quo. See, e. g., Bryan v. Itasca County, 426 U. S. 373, 391-392 (1976); Johnson and Graham’s Lessee v. McIntosh, 8 Wheat. 543, 604 (1823). See also Arizona v. San Carlos Apache Tribe, 463 U. S. 545, 562-563 (1983) (re disclaimer clauses in state Enabling Acts). Contrary to the Court’s revisionist view, Congress had no doubt whatsoever that questions of Pueblo title already had been pre-empted by the Enabling Act,14 and the first clause of *262§ 17 can therefore be nothing more than a reaffirmation of federal pre-emption. The second clause of §17 is part of the same sentence as the first, is linked to the first by the conjunctive “and,” and is phrased in the same prohibitory terms — suggesting a similarity of purpose under any reasonable canon of construction.15 I therefore conclude that § 17, placed in the context of the Nonintercourse Act, the Enabling Act, and the various leasing and right-of-way statutes then in effect, is most comprehensible if viewed simply as reaffirming the status quo represented by those statutes and the Sandoval decision. As set forth below, this unambitious construction best accords with the structure of the Pueblo Lands Act and subsequent congressional legislation, with the legislative history, and with the principles that always have guided us in construing legislation pertaining to Indian tribes.16

*263l-H b — I

The Court concludes, however, that Congress intended by the second clause of § 17 to reject application of the Noninter-course Act “to these lands” and instead to adopt “a new rule of law” authorizing a Pueblo to “convey good title to its lands with the approval of the Secretary of the Interior.” Ante, at 251, 250, 247.

A. Statutory Structure

The Court believes this interpretation “better harmonizes the two clauses of § 17 with the structure of the entire Act.” Ante, at 252. The Court’s interpretation, however, would render wholly superfluous § 16 of the Act, which gave explicit congressional authorization to conveyances of Pueblo lands in one extremely narrow set of circumstances. Specifically, § 16 authorized the sale of land found by the Pueblo Lands Board to belong rightfully to a Pueblo if (1) the land “be situate among lands adjudicated or otherwise determined in favor of non-Indian claimants and apart from the main body of the Indian land”; (2) the Pueblo and the Secretary concurred in the sale; and (3) the land went to “the highest bidder for cash.”17 The purpose of this provision was to “get *264the Indian holdings contiguous to one another.” 1923 Senate Hearings, at 154 (Sen. Jones of New Mexico).

The Court argues vaguely that §16 was “probably considered” an “isolated element” of the Act, and that it somehow uniquely enabled the Secretary to “take the initiative” in “urging” consolidation of Pueblo lands. Ante, at 253, n. 26. This unsupported argument is untenable. As the Solicitor for the Department of the Interior emphasized just last year, “[i]t is inconceivable that Congress would have authorized the sale of Pueblo lands under the very narrow circumstances of Section 16, and then one section later would have empowered the Pueblos to alienate their lands for any purpose and with no standards or conditions other than Secretarial approval. Such an irrational result could not have been intended by Congress.”18

The error of the Court’s interpretation is further exposed by the fact that, since 1924, Congress recurrently has enacted legislation affirmatively authorizing much narrower conveyances of interests in Pueblo lands — legislation that would have had no rational basis if, as the Court concludes, Congress already had authorized unlimited conveyances of Pueblo lands simply upon secretarial approval. For example: (1) In 1928, in response to concern that the existing easement and right-of-way statutes might not technically be applicable to Pueblo lands, Congress enacted legislation clarifying that nine of those statutes, along with “the basic Acts of Congress cited in such sections,” were fully “applicable to the Pueblo Indians of New Mexico and their lands.”19 *265These provisions included numerous procedural and financial safeguards governing such conveyances. (2) Congress in 1933 extended the narrow provisions of § 16 to authorize the sale by the Pueblos and the Secretary of any land that had been taken from a non-Indian claimant by the Pueblo Lands Board.20 Congress’ purpose was to remove the “restrictions in the sale of [these] lands”;21 the legislation was designed to authorize alienation of Pueblo lands only in “a limited number of situations” where necessary to consolidate a tribe’s land base.22 (3) In 1948, Congress authorized the Secretary to grant rights-of-way “for all purposes” across “the lands belonging to the Pueblo Indians in New Mexico,” subject to “the consent of the proper tribal officials” of organized tribes.23 (4) In 1949, Congress authorized the Pueblos and the Secretary to exchange certain Pueblo lands for those in *266the public domain “[f ]or the purpose of consolidation” of tribal lands.24 (5) Similar legislation was enacted in 1961 “[f]or the purpose of improving the land tenure pattern and consolidating Pueblo Indian lands.”25 (6) In 1968, Congress authorized the Cochiti, Pojoaque, Tesuque, and Zuni Pueblos to lease their lands for specified purposes “for a term of not to exceed ninety-nine years,” except for grazing leases which could not exceed 10 years.26 This authorization created an exception for these Tribes from the statutory provisions applicable to the other Pueblo Tribes, which limit Indian leasing of restricted lands to 25 years.27 (7) Congress in 1976 enacted legislation to clarify the full applicability of the general right-of-way provisions to the Pueblos;28 the purpose was “to place the New Mexico Pueblo Indians in the same position relative to grants of rights-of-way across their lands as other federally recognized Indian tribes.”29

Each of these enactments would have been meaningless if § 17 already authorized Pueblo leases of unlimited duration and even outright sales of land. The enactments of 1924, 1933, 1947, and 1961 clearly demonstrate that Congress has authorized alienation of Pueblo lands only where necessary to consolidate the tribal base and to improve land tenure patterns — a carefully crafted effort that the Court’s interpretation today annuls. Similarly, the enactments of 1928, 1948, 1968, and 1976 demonstrate Congress’ intent that leases and rights-of-way on Pueblo lands be subject to the same procedural and financial safeguards that govern such conveyances on Indian lands generally — an intent that is irreconcilable with the notion that § 17 created an entirely independent avenue for alienation of Pueblo title subject only to standardless secretarial approval.

*267B. Legislative History

The Court explains, however, that its baffling interpretation of § 17 is “consistent with the limited legislative history-available.” Ante, at 253. All the Court can offer in support of this assertion is a carefully distilled excerpt from a colloquy between Senator Lenroot and Francis Wilson, an attorney for the Pueblos, during a 1923 Senate hearing. Ante, at 253-254, n. 28. Senator Lenroot inquired “whether it might not [be] advisable to provide that these lands may be sold or alienated with the consent of both the Pueblo and the Secretary of the Interior,” and Wilson replied that it would be “quite desirable under some conditions.” 1923 Senate Hearings, at 155.

Unfortunately, the Court omits some rather crucial language demonstrating that the entire colloquy it relies upon pertained to § 16 rather than to § 17. Senator Lenroot began by asking: “Might there be cases where it would be to the interest of the Indians to sell?” Id., at 154. Wilson responded that “I can not think of one. There might be, but I have not any in mind.” Ibid. Senator Jones of New Mexico then suggested that “where there are allotments, strips here and there, where the title has been divested from the Indian, might it not be advisable as to the strips where non-Indians have not the title, interspersed with strips where non-Indians have the title, that there be some disposition of that land so as to get the Indian holdings contiguous to one another.” Ibid. Everyone present agreed that “[i]t would be very desirable.” Ibid. (Wilson).

The participants turned next to the question whether the Secretary could authorize such conveyances. As was “true generally of the Indian law,” it was agreed that the Secretary could not have “anything to do with it” because “Congress has taken full jurisdiction of the sale of this land,” and would therefore “[absolutely” have “to legislate upon it.” Id., at 155 (Sen. Lenroot, Comm’r Burke, Mr. Renehan, Sen. Jones). It was only at this point that Senator Lenroot queried whether Congress should provide that “these lands may *268be sold or alienated,” and Wilson agreed that it would be “quite desirable under some conditions.” Ibid. Wilson then identified what the “some conditions” were — where the Pueblos “could make swaps and transfers [so] they could get their lands into much better condition.” Ibid.

This “limited” legislative history, ante, at 253, therefore demonstrates that (1) all participants understood that Congress would have to give its approval to any alienation of Pueblo lands, and (2) Congress intended to do so only where necessary “to get the Indian holdings contiguous to one another” — the precise function of the narrowly drafted § 16. Nowhere was it suggested that Congress, after hammering out this limited authorization for alienation of some Pueblo lands, would then intend to authorize alienation of all Pueblo lands.30

Section 17 was drafted by Francis Wilson, an attorney representing the Pueblos in the legislative proceedings,31 and the Court has not suggested how a provision drafted by Indian advocates who were urging simply that the Pueblos be treated like other tribes could possibly have been intended to override the restraints against alienation set forth in the *269Nonintercourse Act. That § 17 was simply intended as a declaratory reaffirmation of the full scope of the Nonintercourse Act is best illustrated by the fact that it provoked no debate, commentary, or opposition. The much more modest § 16, on the other hand, engendered sharp controversy.32 As one historian concluded after reviewing all available legislative history, departmental records, and private correspondence, there is

“nothing in the record to indicate that Wilson or anyone else intended or interpreted Section 17 as authorizing the Pueblos to convey their lands to any greater extent than other Indians, or otherwise modifying the Non-Intercourse Act in any substantive way. Such a construction, if circulated at that time, would certainly have provoked heated debate and opposition from the Collier group and others,33 especially since sales by individuals and tribal officials had in part caused the turmoil that led to the Act. What is remarkable about Section 17 is that it was so easily accepted, apparently by consensus. Almost alone among the lengthy provisions of the various bills, it was undisputed and unamended.”34

After a similar review, the Solicitor for the Department of the Interior found only last year that “[njowhere in the legislative history is there any suggestion that Section 17 was *270intended to grant the Pueblos and the Secretary the power to alienate Pueblo lands.”35 The Court has offered nothing plausibly suggesting the contrary.

C. Administrative Construction

The Court explains, however, that the “uniform contemporaneous view” of executive officials commands “‘very great respect.’” Ante, at 254. Even if this were an appropriate case to defer to a consistent administrative construction,36 the checkered history of the Department of the Interior’s construction of § 17 demonstrates that the Court’s purported deference is wholly unwarranted. “We have recognized previously that the weight of an administrative interpretation will depend, among other things, upon ‘its consistency with earlier and later pronouncements’ of an agency.” Morton v. Ruiz, 415 U. S. 199, 237 (1974), quoting Skidmore v. Swift & Co., 323 U. S. 134, 140 (1944). See also FEC v. Democratic Senatorial Campaign Committee, 454 U. S. 27, 38-39 (1981); United States v. National Assn. of Securities Dealers, Inc., 422 U. S. 694, 718-719 (1975). The record demonstrates that the Department’s construction of § 17 has swung wildly back and forth over the past 60 years.

For the first two years after the Pueblo Lands Act was enacted, the Secretary routinely applied the general right-of-way statutes to the Pueblo, as he had prior to the Act.37 Among the numerous rights-of-way granted pursuant to these restrictive provisions were 50-year easements to the petitioner Mountain States Telephone and Telegraph Company.*27138 Never was there even a hint that § 17 might have worked any change in the law or in the narrow exceptions to Congress’ policy against alienation.

In 1926, however, a new Special Assistant to the Attorney General, George A. H. Fraser, concluded that the existing right-of-way statutes probably did not cover the Pueblos: “It is not quite certain that [the statutes do] not include them, but it looks as though [they] did not.”39 Moreover, Fraser concluded that the first clause of §17 — prohibiting any alienation “except as may hereafter be provided by Congress” — meant literally that no transfer of any interest in Pueblo land could occur until Congress acted at some undetermined point in the future.40 Fraser accordingly began filing trespass suits pursuant to the Pueblo Lands Act against railroad companies and utilities that had rights-of-way across Pueblo lands.41

These companies, obviously, were not anxious to submit to extended litigation. A representative of one of them stated that it was essential to find a method to get easements and rights-of-way “railroaded thru” the federal bureaucracy with a minimum of delay.42 The record clearly shows that the construction of § 17 to permit Pueblo alienation was developed, not by a Government official, but by an attorney for a Chicago bond house underwriting one of the railroads.43 *272Attorneys with the Office of Indian Affairs believed this new interpretation was “doubtful” and “inconsistent” with the underlying premises of the Pueblo Lands Act.44 Fraser himself thought it was inconsistent to authorize the Pueblos “to convey, even subject to an approval, which must usually be based on the recommendation of some local official who may or may not be fully informed and disinterested.”45 Nevertheless, Fraser recommended and obtained the Secretary’s approval of this approach on the theory that “the general good would be served by acquiescing rather than by urging the doubts suggested by Sec. 17.”46 Agency officials, however, continued to believe the interpretation was “doubtful.”47

From 1926 until 1933, 55 rights-of-way were obtained by this method.48 Many of the grantees would otherwise have been forced to defend quiet title suits under the Pueblo Lands Act. By acquiring deeds directly from the Pueblos, they were able either to avoid litigation or to be dismissed out as defendants, as was the petitioner in this case.49 Fraser described this method as “the cheapest and easiest way of getting rid of” controversies involving Pueblo lands.50 *273There usually was “no difficulty ... at all” in persuading the Pueblos to sign such deeds;51 a “carload of lumber” was sometimes thrown in to sweeten the deal.52 As the Solicitor for the Department of the Interior recently observed, this construction of § 17 frequently resulted in the outright avoidance of clearly applicable statutes that would have provided far greater procedural and financial protection to the Pueblos than a process that involved the “mere approval of an existing agreement negotiated by a tribe.”53 Cf. United States v. Locke, 471 U. S. 84, 124, n. 12 (1985) (Stevens, J., dissent ing) (criticizing the Department of the Interior’s use of “every technical construction” of an ambiguous statute to enable the “suck[ing] up” of property “much as a vacuum cleaner, if not watched closely, will suck up jewelry or loose money”).

Section 17 was used only sporadically from the 1920’s to the 1950’s. From 1926 to 1933 there were 55 approvals pursuant to its terms; from 1936 to 1944 there were 13; from 1953 to 1959 there were ll.54 Section 17 has never been used since 1959 to authorize any Pueblo conveyance.55 On the other hand, since the 1920’s at least 779 rights-of-way over Pueblo lands have been obtained pursuant to the generally applicable right-of-way statutes and in accordance with the strict safeguards contained therein.56 In the 1940’s, the Solicitor for *274the Department of the Interior concluded that § 17 did not authorize the acquisition of rights-of-way and that any such acquisitions must be made pursuant to the general statutes.57 Nevertheless, § 17 occasionally was invoked thereafter where a “small amount of acreage [was] involved” and in order to avoid “considerable work for . . . the agency.”58 Consistent with the views of the Department in recent generations, the Department’s Solicitor concluded last year that “Congress did not intend Section 17 to be construed as authorizing the alienation of Pueblo lands,” that the contrary view was “irrational,” and that the courts in this case had been correct to “disregard the Department’s [earlier] interpretation of that section.”59 And as the Government has emphasized before this Court, the earlier administrative construction — such as it was — applied only to rights-of-way except for one or two isolated incidents, and therefore cannot reasonably support an interpretation of § 17 that would generally authorize outright alienation of Pueblo lands.60

*275The Court’s notion of deference to agency expertise in an Indian case, then, appears to go something like this: where a proffered construction of a statute was not followed for two years but was then advocated by private attorneys and “acquiesce[d]” in by the Government as a matter of convenience; where that construction was then used to avoid the fiduciary safeguards of other legislation but withered away after a decade or two; where the construction was followed in less than 10% of the cases to which it could have been applied; where the construction was rejected by the agency more than 40 years ago and branded “irrational” by the agency’s top legal officer just last year; and where the Government has urged that the construction be given a narrow compass at most, this Court as a matter of deference to such a “uniform” construction will adopt the most extreme version of that construction as the law of the land.61

D. Canons of Construction

Finally, even if the Court’s interpretation of § 17 had some plausible basis in the structure of the Pueblo Lands Act or its *276legislative history, the canons of construction that this Court' has followed since early in the 19th century nevertheless should compel its rejection given that other interpretations of § 17 more faithfully hew to the terms of the Nonintercourse Act. The Constitution grants Congress — not this Court— the power to set national policy respecting Indian lands,62 and since the 19th century the cornerstone of Congress’ policy has been to impose strict restraints on alienation of Indian title — a policy grounded on the federal trust responsibility toward Indian tribes.63 In accordance with general fiduciary principles, departures from this policy against alienation are not to be “lightly implied.” United States ex rel. Hualpai Indians v. Santa Fe Pacific R. Co., 314 U. S. 339, 354 (1941). Ambiguous language in Indian statutes therefore always has been construed in favor of restrictions on alienation. See, e. g., Northern Cheyenne Tribe v. Hollowbreast, 425 U. S. 649, 656 (1976); Starr v. Long Jim, 227 U. S. 613, 622-623 (1913). Congressional intent to authorize the extin-guishment of Indian title must be “plain and unambiguous,” United States ex rel. Hualpai Indians v. Santa Fe Pacific R. Co., supra, at 346—that is, it either “must be expressed on the face of the Act or be clear from the surrounding circumstances and legislative history,” Mattz v. Arnett, 412 U. S. 481, 505 (1973) (termination of reservation).64 Just this *277Term, we followed these principles in concluding that various congressional enactments had neither authorized nor ratified sales of land by the Oneida Indian Nation of New York; the congressional language, we found, “far from demonstrates a plain and unambiguous intent to extinguish Indian title.” County of Oneida v. Oneida Indian Nation of New York, 470 U. S. 226, 248 (1985). Cf. Montana v. Blackfeet Tribe of Indians, 471 U. S. 759, 765-766 (1985) (state taxation of Indian lands).

Section 17’s “puzz[ling]” language, ante, at 253, n. 27, can hardly be characterized as a “plain and unambiguous” statement of congressional intent to enable the Pueblos, unlike any other Indian tribe holding unallotted lands, to alienate their property. The language itself is phrased entirely in the negative (“No right, title or interest shall... be acquired . . . and no sale, grant, lease .... shall be of any validity” (emphasis added)), and is more plausibly read as simply declaratory of restraints already in effect. See supra, at 261-262. When Congress intends affirmatively to authorize Indian tribes or the Secretary to convey interests in Indian lands, it consistently has done so in clear, express language (e. g., “[t]he Secretary ... is authorized to grant permission”; “restricted Indian lands . . . may be leased by the Indian owners”).65 Congress therefore was “fully aware of the means” by which alienation could have been authorized, Mattz v. Arnett, supra, at 504, and not to employ those means in §17. Moreover, if § 17 was intended to have the broad operative significance that the Court unearths, it is curious why Congress never *278has seen fit to have it codified in Title 25 of the United States Code. For these reasons, and because the Court’s contrary interpretation so clearly flouts the structure of the Pueblo Lands Act, the legislative history, and the significance of subsequent legislation, I must conclude that § 17 can only be read as having attempted to set forth a broad declaratory reaffirmation of the Nonintercourse Act as Congress believed that Act applied to the Pueblos.66

It might be argued, however, that the Court’s construction treats the Pueblos with a greater degree of respect by giving them broader automony in disposing of tribal lands, and that a contrary reading simply reflects a view that the Pueblos are somehow incapable of managing their own affairs. There is no question that the federal policy against alienation at one time embodied paternalistic notions of “protecting Indians from their own improvidence.”67 But the federal policy now rests on much different grounds. Congress’ policy reflects its determination that restraints on alienation are necessary to “insulate Indian lands from the full impact of market forces” and thereby to preserve “a substantial tribal land base [that is] essential to the existence of tribal society and *279culture.”68 As the respondent Pueblo of Santa Ana has argued:

“There is no inconsistency in the Pueblos wanting to insure the applicability to their lands of the full array of federal restrictions on alienation. Like other tribes, the Pueblos as communities take the long view in wanting to preserve their homelands. Bitter experience prior to the Pueblo Lands Act, and even more recently . . . has shown that tribal councils can be induced to agree to unwise conveyances. A single such transaction could cause the total loss of the land base, and the ultimate disappearance of the tribal entity. Reposing an unconditioned, delegable power of approval in the Secretary, moreover, may not provide adequate protection against improvident transactions. . . . Characteristically, it is non-Indian entities such as Petitioner and amici who argue for ‘emancipation’ of the Pueblos.”69

The federal policy against alienation, and this Court’s longstanding canons of construction deferring to that policy, may or may not ultimately be sound. But that is a question for Congress, and it is not for this Court to indulge in unsupportable statutory analysis simply to further its own views on the proper management of Indian affairs.70

*280HH 1 — 1 1 — 1

As it came to us on petition for a writ of certiorari, this case involved an obscure statute that related only to the 19 Pueblo Tribes in New Mexico. With but one or two exceptions, it never had been used to sanction outright alienation of tribal lands, see n. 60, supra, and it had been used to convey lesser interests approximately 80 times in its 60-year history. Moreover, the statute had fallen into virtually complete disuse and oblivion for the last two generations. We also were advised that the question presented — however important to the individual Tribes and companies involved— nevertheless implicated little more than a handful of easements.71 And, we were advised, most of those easements already had been renegotiated (under the general provisions, not § 17).72

In addition, the District Court for the District of New Mexico and the Court of Appeals for the Tenth Circuit had both concluded that petitioner’s proffered construction of § 17 did not accord with the well-settled status of the Pueblo Tribes.73 Those courts, by virtue of their geographic position, have essentially exercised exclusive jurisdiction over federal questions pertaining to the Pueblos since New Mexico statehood. As a result of their continuing exposure to cases involving the Pueblos, these courts have been in the best position to understand “the unique and ‘interesting history of the Pueblo Indians,”’ ante, at 240, and to evaluate at close *281range the relationship between the Pueblo Tribes and the Federal Government. With the exception of several procedural dismissals of quiet title actions in the 1920’s,74 these courts over the last 60 years have consistently held that Pueblo lands axe fully governed by the Nonintercourse Act and that such lands are inalienable without explicit congressional authorization.75 They also have consistently held that *282§ 17 in no way authorizes alienation of Pueblo lands.76 The decisions below were merely the most recent applications of this settled law. And this settled law not only did not conflict with decisions of this Court, but followed directly from them.77

Notwithstanding all of these considerations, the Court granted certiorari78 and today holds that the Pueblos are not *283subject to the terms of the Nonintercourse Act and that, under §17, they may instead “convey good title to [their] lands with the approval of the Secretary of the Interior.” Ante, at 247. The Court, ironically, has thus come full circle. In United States v. Joseph, 94 U. S. 614 (1877), the Court exempted the Pueblos from the Nonintercourse Act. As the Court subsequently conceded, that decision rested on assumptions “at variance with other recognized sources of information . . . and with the long-continued action of the legislative and executive departments.” United States v. Sandoval, 231 U. S., at 49. Congress was required to enact the Pueblo Lands Act to resolve the morass that the Court’s uninformed and improvident decision in Joseph had created. Today, in its first and probably last direct encounter with the Act, the Court once again renders an uninformed, improvident, and sweeping opinion that is “at variance . . . with the long-continued action of the legislative and executive departments.” United States v. Sandoval, supra, at 49. And, once again, Congress most likely will be forced to step in and clean up after the Court’s handiwork.

I dissent.