Leon Carter appeals the district court’s 1 dismissal of his action as barred by collateral estoppel and res judicata. Upon careful review, we conclude that the dismissal was proper. See Nolles v. State Comm. *608 for Reorg. of Sch. Dists., 524 F.3d 892, 901 (8th Cir. 2008) (res judicata effect of first forum’s judgment is governed by first forum’s law; de novo standard of review); see also Hauschildt v. Beckingham, 686 N.W.2d 829, 840 (Minn. 2004) (standard for applying res judicata; doctrine applies not only to every matter which was actually litigated, but also to every matter which might have been litigated). Accordingly, we affirm. See 8th Cir. R. 47B.