On February 28, 1989, Silas Cedric High Elk, Jr. struck and killed Gladys LeBeau *661 while operating a motor vehicle on South Dakota Highway 63, which runs through the Cheyenne River Indian reservation. High Elk was charged with involuntary manslaughter under 18 U.S.C. § 1153 (1988), the Indian Major Crimes Act 1 . High Elk moved to dismiss the indictment for lack of jurisdiction, arguing that exclusive jurisdiction over highways in Indian land was assumed by South Dakota under Public Law 280, which allowed states to assume jurisdiction over Indian land within their boundaries, see Act of Aug. 15, 1953, ch. 505, 67 Stat. 588, codified in part at 18 U.S.C. § 1162, 25 U.S.C. §§ 1321-22 (1988); see also S.D. Codified Laws Ann. § 1-1-18 (1985). High Elk argued that since Public Law 280 repealed the Major Crimes Act with respect to the six states that automatically received jurisdiction over Indians 2 , the Major Crimes Act was also repealed in those states that voluntarily assumed jurisdiction under Public Law 280, such as South Dakota. Except in the mandatory states, we know of no authority which holds that federal courts lack jurisdiction under the Major Crimes Act in those states that have assumed jurisdiction under Public Law 280.

The district court 3 denied High Elk’s motion, ruling that the Major Crimes Act was repealed only in those specific states identified in Public Law 280. 715 F.Supp. 285. We affirm the district court. 4