however, holding that, at least in that case, “default judgment is not the appropriate avenue” to issue declaratory relief.
The School District and. its employees then moved for summary judgment in all of the actions. The district court ultimately denied the motions and concluded that the Tribal Court, in fact, had jurisdiction over the claims. In so holding, the district court found inapplicable the United States Supreme Court’s decision in Montana v. United States, 450 U.S. 544, 101 S.Ct. 1245, 67 L.Ed.2d 493 (1981). It further found that, even if Montana were applicable, the Tribal Court would nevertheless have jurisdiction because the School District entered into the Plans of Operations with the Tribe.
II. Discussion
A. Tribal Court Jurisdiction
The School District and its employees argue on appeal that the Tribal Court lacked jurisdiction over them and, consequently, that the district court erred in denying their motions for summary judgment. We review de novo a district court’s denial of summary judgment. Solomon v. Petray, 699 F.3d 1034, 1038 (8th Cir.2012) (citation omitted). “The extent of tribal court subject matter jurisdiction over claims against nonmembers of the Tribe is a question of federal law which we review de novo.” Attorney’s Process & Investigation Servs., Inc. v. Sac & Fox Tribe of Miss. in Iowa, 609 F.3d 927, 934 (8th Cir.2010) (citation omitted).
No federal statute or a treaty specifically provides the Tribal Court with jurisdiction over the claims at issue in this case; therefore, the Tribal Court’s jurisdiction must arise from its “retained or inherent sovereignty.” Atkinson Trading Co., Inc. v. Shirley, 532 U.S. 645, 649-50, 121 S.Ct. 1825, 149 L.Ed.2d 889 (2001). We analyze the contours of a tribal court’s inherent jurisdiction over nonmembers of the tribe within the framework and principles set forth in Montana, which remains the “ ‘pathmarking case’ ” on the subject. Hicks, 533 U.S. at 358, 121 S.Ct. 2304 (quoting Strate, 520 U.S. at 445, 117 S.Ct. 1404). In Montana, the Supreme Court addressed whether a tribe could prohibit hunting and fishing activities by non-Indians on reservation land owned in fee simple by non-Indians. As a general matter, the Court held, “the inherent sovereign powers of an Indian tribe do not extend to the activities of %oranembers of the tribe.” 450 U.S. at 565, 101 S.Ct. 1245 (emphases added). The Court then noted, however, two relatively narrow exceptions to this general rule:
To be sure, Indian tribes retain inherent sovereign power to exercise some forms of civil jurisdiction over non-Indians on their reservations, even on non-Indian fee lands. A tribe may regulate, through taxation, licensing, or other means, the activities of nonmembers who enter consensual relationships with the tribe or its members, through commercial dealing, contracts, leases, or other arrangements. A tribe may also retain inherent power to exercise civil authority over the conduct of non-Indians on fee lands within its reservation when that conduct threatens or has some direct effect on the political integrity, the economic security, or the health or welfare of the tribe.
Id. at 565-66, 101 S.Ct. 1245 (emphases added) (internal citations omitted).3 These
3
The Tribal Court’s jurisdiction cannot exceed the Tribe’s regulatory power. See Strate, 520 U.S. at 453, 117 S.Ct. 1404 (“As to nonmembers, we hold, a tribe’s adjudicative jurisdiction does not exceed its legislative jurisdiction.”); Attorney’s Process, 609 F.3d at 936 *658(tribal court jurisdiction "turns upon whether the actions at issue in the litigation are regulable by the tribe” (quoting Hicks, 533 U.S. at 367 n. 8, 121 S.Ct. 2304)).