NOTICE: This opinion is subject to formal revision before publication in the preliminary print of the United States Reports. Readers are requested to notify the Reporter of Decisions, Supreme Court of the United States, Wash-ington, D.C. 20543, of any typographical or other formal errors, in order that corrections may be made before the preliminary print goes to press.

SUPREME COURT OF THE UNITED STATES

No. 95–1872

WILLIAM STRATE, ASSOCIATE TRIBAL JUDGE, TRIBAL COURT OF THE THREE AFFILIATED TRIBES OF THE FORT BERTHOLD INDIAN RESERVATION, et al., PETITIONERS v. A–1 CONTRAC- TORS and LYLE STOCKERT

on writ of certiorari to the united states court of appeals for the eighth circuit

[April 28, 1997]

Justice Ginsburg delivered the opinion of the Court.

This case concerns the adjudicatory authority of tribal courts over personal injury actions against defendants who are not tribal members. Specifically, we confront this question: When an accident occurs on a portion of a public highway maintained by the State under a federally granted right-of-way over Indian reservation land, may tribal courts entertain a civil action against an allegedly negligent driver and the driver's employer, neither of whom is a member of the tribe?

Such cases, we hold, fall within state or federal regulatory and adjudicatory governance; tribal courts may not entertain claims against nonmembers arising out of accidents on state highways, absent a statute or treaty authorizing the tribe to govern the conduct of nonmembers on the highway in question. We express no view on the governing law or proper forum when an accident occurs on a tribal road within a reservation.

In November 1990, petitioner Gisela Fredericks and respondent Lyle Stockert were involved in a traffic accident on a portion of a North Dakota state highway running through the Fort Berthold Indian Reservation. The highway strip crossing the reservation is a 6.59-mile stretch of road, open to the public, affording access to a federal water resource project. North Dakota maintains the road under a right-of-way granted by the United States to the State's Highway Department; the right-of-way lies on land held by the United States in trust for the Three Affiliated Tribes (Mandan, Hidatsa, and Arikara) and their members.

The accident occurred when Fredericks' automobile collided with a gravel truck driven by Stockert and owned by respondent A–1 Contractors, Stockert's employer. A–1 Contractors, a non-Indian-owned enterprise with its principal place of business outside the reservation, was at the time under a subcontract with LCM Corporation, a corporation wholly owned by the Tribes, to do landscaping work related to the construction of a tribal community building. A–1 Contractors performed all work under the subcontract within the boundaries of the reservation. The record does not show whether Stockert was engaged in subcontract work at the time of the accident. Neither Stockert nor Fredericks is a member of the Three Affiliated Tribes or an Indian. Fredericks, however, is the widow of a deceased member of the Tribes and has five adult children who are tribal members.

Fredericks sustained serious injuries in the accident and was hospitalized for 24 days. In May 1991, she sued respondents A–1 Contractors and Stockert, as well as A–1 Contractors' insurer, in the Tribal Court for the Three Affiliated Tribes of the Fort Berthold Reservation. In the same lawsuit, Fredericks' five adult children filed a loss-of-consortium claim. Together, Fredericks and her children sought damages exceeding $13 million. App. 8–10.

Respondents and the insurer made a special appearance in the Tribal Court to contest that court's personal and subject-matter jurisdiction. The Tribal Court ruled that it had authority to adjudicate Gisela Fredericks' case, and therefore denied respondents' motion to dismiss the action. Id., at 24–25. Respondents appealed the Tribal Court's jurisdictional ruling to the Northern Plains Intertribal Court of Appeals, which affirmed. Id., at 36. Thereafter, pursuant to the parties' stipulation, the Tribal Court dismissed the insurer from the suit. See id., at 38–40.

Before Tribal Court proceedings resumed, respondents commenced this action in the United States District Court for the District of North Dakota. Naming as defendants Fredericks, her adult children, the Tribal Court, and Tribal Judge William Strate, respondents sought a declaratory judgment that, as a matter of federal law, the Tribal Court lacked jurisdiction to adjudicate Fredericks' claims. The respondents also sought an injunction against further proceedings in the Tribal Court. See id., at 41–45.

Relying particularly on this Court's decisions in National Farmers Union Ins. Cos. v. Crow Tribe, 471 U. S. 845 (1985), and Iowa Mut. Ins. Co. v. LaPlante, 480 U. S. 9 (1987), the District Court determined that the Tribal Court had civil jurisdiction over Fredericks' complaint against A–1 Contractors and Stockert; accordingly, on cross-motions for summary judgment, the District Court dismissed the action. App. 54–67. On appeal, a divided panel of the United States Court of Appeals for the Eighth Circuit affirmed. App. 68–90. The Eighth Circuit granted rehearing en banc and, in an 8-to-4 decision, reversed the District Court's judgment. 76 F. 3d 930 (1996). The Court of Appeals concluded that our decision in Montana v. United States, 450 U. S. 544 (1981), was the controlling precedent, and that, under Montana, the Tribal Court lacked subject-matter jurisdiction over the dispute.

We granted certiorari, 519 U. S. ___ (1996), and now affirm.

Our case law establishes that, absent express authorization by federal statute or treaty, tribal jurisdiction over the conduct of nonmembers exists only in limited circumstances. In Oliphant v. Suquamish Tribe, 435 U. S. 191 (1978), the Court held that Indian tribes lack criminal jurisdiction over non-Indians. Montana v. United States, decided three years later, is the pathmarking case concerning tribal civil authority over nonmembers. Montana concerned the authority of the Crow Tribe to regulate hunting and fishing by non-Indians on lands within the Tribe's reservation owned in fee simple by non-Indians. The Court said in Montana that the restriction on tribal criminal jurisdiction recognized in Oliphant rested on principles that support a more "general proposition." 450 U. S., at 565. In the main, the Court explained, "the inherent sovereign powers of an Indian tribe"—those powers a tribe enjoys apart from express provision by treaty or statute—"do not extend to the activities of nonmembers of the tribe." Ibid. The Montana opinion added, however, that in certain circumstances, even where Congress has not expressly authorized it, tribal civil jurisdiction may encompass nonmembers:

"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 565–566 (citations and footnote omitted).

The term "non-Indian fee lands," as used in this passage and throughout the Montana opinion, refers to reservation land acquired in fee simple by non-Indian owners. See id., at 548.

Montana thus described a general rule that, absent a different congressional direction, Indian tribes lack civil authority over the conduct of nonmembers on non-Indian land within a reservation, subject to two exceptions: The first exception relates to nonmembers who enter consensual relationships with the tribe or its members; the second concerns activity that directly affects the tribe's political integrity, economic security, health, or welfare. The Montana Court recognized that the Crow Tribe retained power to limit or forbid hunting or fishing by nonmembers on land still owned by or held in trust for the Tribe. Id., at 557. The Court held, however, that the Tribe lacked authority to regulate hunting and fishing by non-Indians on land within the Tribe's reservation owned in fee simple by non-Indians. Id., at 564–567.

Petitioners and the United States as amicus curiae urge that Montana does not control this case. They maintain that the guiding precedents are National Farmers and Iowa Mutual, and that those decisions establish a rule converse to Montana's. Whatever Montana may instruct regarding regulatory authority, they insist, tribal courts retain adjudicatory authority in disputes over occurrences inside a reservation, even when the episode-in-suit involves nonmembers, unless a treaty or federal statute directs otherwise. Petitioners, further supported by the United States, argue, alternately, that Montana does not cover lands owned by, or held in trust for, a tribe or its members. Montana holds sway, petitioners say, only with respect to alienated reservation land owned in fee simple by non-Indians. We address these arguments in turn.

We begin with petitioners' contention that National Farmers and Iowa Mutual broadly confirm tribal-court civil jurisdiction over claims against nonmembers arising from occurrences on any land within a reservation. We read our precedent differently. National Farmers and Iowa Mutual, we conclude, are not at odds with, and do not displace, Montana. Both decisions describe an exhaustion rule allowing tribal courts initially to respond to an invocation of their jurisdiction; neither establishes tribal-court adjudicatory authority, even over the lawsuits involved in those cases. Accord, Brendale v. Confederated Tribes and Bands of Yakima Nation, 492 U. S. 408, 427, n. 10 (1989) (opinion of White, J.).

National Farmers involved a federal-court challenge to a tribal court's jurisdiction over a personal injury action initiated on behalf of a Crow Indian minor against a Montana School District. The accident-in-suit occurred when the minor was struck by a motorcycle in an elementary school parking lot. The school occupied land owned by the State within the Crow Indian Reservation. See 471 U. S., at 847. The School District and its insurer sought a federal-court injunction to stop proceedings in the Crow Tribal Court. See id., at 848. The District Court granted the injunction, but the Court of Appeals reversed, concluding that federal courts lacked subject-matter jurisdiction to entertain such a case. See id., at 848–849.

We reversed the Court of Appeals' judgment and held that federal courts have authority to determine, as a matter "arising under" federal law, see 28 U. S. C. §1331, whether a tribal court has exceeded the limits of its jurisdiction. See 471 U. S., at 852–853. We further held, however, that the federal suit was premature. Ordinarily, we explained, a federal court should stay its hand "until after the Tribal Court has had a full opportunity to determine its own jurisdiction." Id., at 857. Finding no cause for immediate federal court intervention, we remanded the case, leaving initially to the District Court the question "[w]hether the federal action should be dismissed, or merely held in abeyance pending . . . further Tribal Court proceedings." Ibid.

Petitioners underscore the principal reason we gave in National Farmers for the exhaustion requirement there stated. Tribal-court jurisdiction over non-Indians in criminal cases is categorically restricted under Oliphant, we observed, while in civil matters "the existence and extent of a tribal court's jurisdiction will require a careful examination of tribal sovereignty, the extent to which that sovereignty has been altered, divested, or diminished, as well as a detailed study of relevant statutes, Executive Branch policy as embodied in treaties and elsewhere, and administrative or judicial decisions." 471 U. S., at 855–856 (footnote omitted).

The Court's recognition in National Farmers that tribal courts have more extensive jurisdiction in civil cases than in criminal proceedings, and of the need to inspect relevant statutes, treaties, and other materials, does not limit Montana's instruction. As the Court made plain in Montana, the general rule and exceptions there announced govern only in the absence of a delegation of tribal authority by treaty or statute. In Montana itself, the Court examined the treaties and legislation relied upon by the Tribe and explained why those measures did not aid the Tribe's case. See 450 U. S., at 557–563. Only after and in light of that examination did the Court address the Tribe's assertion of "inherent sovereignty," and formulate, in response to that assertion, Montana's general rule and exceptions to it. In sum, we do not extract from National Farmers anything more than a prudential exhaustion rule, in deference to the capacity of tribal courts "to explain to the parties the precise basis for accepting [or rejecting] jurisdiction." 471 U. S., at 857.

Iowa Mutual involved an accident in which a member of the Blackfeet Indian Tribe was injured while driving a cattle truck within the boundaries of the reservation. 480 U. S., at 11. The injured member was employed by a Montana corporation that operated a ranch on reservation land owned by Blackfeet Indians residing on the reservation. See ibid. The driver and his wife, also a Tribe member, sued in the Blackfeet Tribal Court, naming several defendants: the Montana corporation that employed the driver; the individual owners of the ranch; the insurer of the ranch; and an independent insurance adjuster representing the insurer. See ibid. Over the objection of the insurer and the insurance adjuster—both companies not owned by members of the Tribe—the Tribal Court determined that it had jurisdiction to adjudicate the case. See id., at 12.

Thereafter, the insurer commenced a federal-court action against the driver, his wife, the Montana corporation, and the ranch owners. See ibid. Invoking federal jurisdiction based on the parties' diverse citizenship, see 28 U. S. C. §1332, the insurer alleged that it had no duty to defend or indemnify the Montana corporation or the ranch owners because the injuries asserted by the driver and his wife fell outside the coverage of the applicable insurance policies. See 480 U. S., at 12–13. The Federal District Court dismissed the insurer's action for lack of subject-matter jurisdiction, and the Court of Appeals affirmed. See id., at 13–14.

We reversed. Holding that the District Court had diversity-of-citizenship jurisdiction over the insurer's complaint, we remanded, as in National Farmers, for a determination whether "the federal action should be stayed pending further Tribal Court proceedings or dismissed." 480 U. S., at 20, n. 14. The Court recognized in Iowa Mutual that the exhaustion rule stated in National Farmers was "prudential," not jurisdictional. 480 U. S., at 20, n. 14; see also id., at 16, n. 8 (stating that "[e]xhaustion is required as a matter of comity, not as a jurisdictional prerequisite"). Respect for tribal self-government made it appropriate "to give the tribal court a `full opportunity to determine its own jurisdiction.'" Id., at 16 (quoting National Farmers, 471 U. S., at 857). That respect, the Court reasoned, was equally in order whether federal-court jurisdiction rested on §1331 (federal question) or on §1332 (diversity of citizenship). 480 U. S., at 17–18. Elaborating on the point, the Court stated:

"Tribal authority over the activities of non-Indians on reservation lands is an important part of tribal sovereignty. See Montana v. United States, 450 U. S. 544, 565–566 (1981); Washington v. Confederated Tribes of Colville Indian Reservation, 447 U. S. 134, 152–153 (1980); Fisher v. District Court [of Sixteenth Judicial Dist. of Mont.], 424 U. S. [382,] 387–389 [(1976)]. Civil jurisdiction over such activities presumptively lies in the tribal courts unless affirmatively limited by a specific treaty provision or federal statute. . . . In the absence of any indication that Congress intended the diversity statute to limit the jurisdiction of the tribal courts, we decline petitioner's invitation to hold that tribal sovereignty can be impaired in this fashion." Iowa Mutual, 480 U. S., at 18.

Petitioners and the United States fasten upon the Court's statement that "[c]ivil jurisdiction over such activities presumptively lies in the tribal courts." Read in context, however, this language scarcely supports the view that the Montana rule does not bear on tribal-court adjudicatory authority in cases involving nonmember defendants.

The statement stressed by petitioners and the United States was made in refutation of the argument that "Congress intended the diversity statute to limit the jurisdiction of the tribal courts." 480 U. S., at 18. The statement is preceded by three informative citations. The first citation points to the passage in Montana in which the Court advanced "the general proposition that the inherent sovereign powers of an Indian tribe do not extend to the activities of nonmembers of the tribe," 450 U. S., at 565, with two prime exceptions, id., at 565–566. The case cited second is Colville, a decision the Montana Court listed as illustrative of the first Montana exception, applicable to "nonmembers who enter consensual relationships with the tribe or its members," 450 U. S., at 565–566; the Court in Colville acknowledged inherent tribal authority to tax "non-Indians entering the reservation to engage in economic activity," 447 U. S., at 153. The third case noted in conjunction with the Iowa Mutual statement is Fisher v. District Court of Sixteenth Judicial Dist. of Mont., 424 U. S. 382 (1976), a decision the Montana Court cited in support of the second Montana exception, covering on-reservation activity of nonmembers bearing directly "on the political integrity, the economic security, or the health or welfare of the tribe." 450 U. S., at 566. The Court held in Fisher that a tribal court had exclusive jurisdiction over an adoption proceeding when all parties were members of the tribe and resided on its reservation. See 424 U. S., at 383, 389. State-court jurisdiction over such matters, the Court said, "plainly would interfere with the powers of self-government conferred upon the . . . Tribe and exercised through the Tribal Court." Id., at 387. The Court observed in Fisher that state courts may not exercise jurisdiction over disputes arising out of on-reservation conduct—even over matters involving non-Indians—if doing so would "`infring[e] on the right of reservation Indians to make their own laws and be ruled by them.'" Id., at 386 (citation omitted).

In light of the citation of Montana, Colville, and Fisher, the Iowa Mutual statement emphasized by petitioners does not limit the Montana rule. In keeping with the precedent to which Iowa Mutual refers, the statement stands for nothing more than the unremarkable proposition that, where tribes possess authority to regulate the activities of nonmembers, "[c]ivil jurisdiction over [disputes arising out of] such activities presumptively lies in the tribal courts." 480 U. S., at 18.

Recognizing that our precedent has been variously interpreted, we reiterate that National Farmers and Iowa Mutual enunciate only an exhaustion requirement, a "prudential rule," see Iowa Mutual, 480 U. S., at 20, n. 14, based on comity, see id., at 16, n. 8. These decisions do not expand or stand apart from Montana's instruction on "the inherent sovereign powers of an Indian tribe." 450 U. S., at 565. While Montana immediately involved regulatory authority, the Court broadly addressed the concept of "inherent sovereignty." Id., at 563. Regarding activity on non-Indian fee land within a reservation, Montana delineated—in a main rule and exceptions—the bounds of the power tribes retain to exercise "forms of civil jurisdiction over non-Indians." Id., at 565. As to nonmembers, we hold, a tribe's adjudicative jurisdiction does not exceed its legislative jurisdiction. Absent congressional direction enlarging tribal-court jurisdiction, we adhere to that understanding. Subject to controlling provisions in treaties and statutes, and the two exceptions identified in Montana, the civil authority of Indian tribes and their courts with respect to non-Indian fee lands generally "do[es] not extend to the activities of nonmembers of the tribe." Ibid.

We consider next the argument that Montana does not govern this case because the land underlying the scene of the accident is held in trust for the Three Affiliated Tribes and their members. Petitioners and the United States point out that in Montana, as in later cases following Montana's instruction—Brendale v. Confederated Tribes and Bands of Yakima Nation, 492 U. S. 408 (1989), and South Dakota v. Bourland, 508 U. S. 679 (1993), described supra, at 6–7, n. 6—the challenged tribal authority related to nonmember activity on alienated, non-Indian reservation land. We "can readily agree," in accord with Montana, 450 U. S., at 557, that tribes retain considerable control over nonmember conduct on tribal land. On the particular matter before us, however, we agree with respondents: The right-of-way North Dakota acquired for the State's highway renders the 6.59-mile stretch equivalent, for nonmember governance purposes, to alienated, non-Indian land.

Congress authorized grants of rights-of-way over Indian lands in 1948 legislation. Act of Feb. 5, 1948, ch. 45, 62 Stat. 17, 25 U. S. C. §§323–328. A grant over land belonging to a tribe requires "consent of the proper tribal officials," §324, and the payment of just compensation, §325. The grant involved in this case was made, pursuant to the federal statute, in 1970. Its purpose was to facilitate public access to Lake Sakakawea, a federal water resource project under the control of the Army Corps of Engineers.

In the granting instrument, the United States conveyed to North Dakota "an easement for a right-of-way for the realignment and improvement of North Dakota State Highway No. 8 over, across and upon [specified] lands." App. to Brief for Respondents 1. The grant provides that the State's "easement is subject to any valid existing right or adverse claim and is without limitation as to tenure, so long as said easement shall be actually used for the purpose . . . specified." Id., at 3. The granting instrument details only one specific reservation to Indian landowners:

"The right is reserved to the Indian land owners, their lessees, successors, and assigns to construct crossings of the right-of-way at all points reasonably necessary to the undisturbed use and occupan[cy] of the premises affected by the right-of-way; such crossings to be constructed and maintained by the owners or lawful occupants and users of said lands at their own risk and said occupants and users to assume full responsibility for avoiding, or repairing any damage to the right-of-way, which may be occasioned by such crossings." Id., at 3–4.

Apart from this specification, the Three Affiliated Tribes expressly reserved no right to exercise dominion or control over the right-of-way.

Forming part of the State's highway, the right-of-way is open to the public, and traffic on it is subject to the State's control. The Tribes have consented to, and received payment for, the State's use of the 6.59-mile stretch for a public highway. They have retained no gatekeeping right. So long as the stretch is maintained as part of the State's highway, the Tribes cannot assert a landowner's right to occupy and exclude. Cf. Bourland, 508 U. S., at 689 (regarding reservation land acquired by the United States for operation of a dam and a reservoir, Tribe's loss of "right of absolute and exclusive use and occupation . . . implies the loss of regulatory jurisdiction over the use of the land by others"). We therefore align the right-of-way, for the purpose at hand, with land alienated to non-Indians. Our decision in Montana, accordingly, governs this case.

Petitioners and the United States refer to no treaty or statute authorizing the Three Affiliated Tribes to entertain highway-accident tort suits of the kind Fredericks commenced against A–1 Contractors and Stockert. Rather, petitioners and the United States ground their defense of tribal-court jurisdiction exclusively on the concept of retained or inherent sovereignty. Montana, we have explained, is the controlling decision for this case. To prevail here, petitioners must show that Fredericks' tribal-court action against nonmembers qualifies under one of Montana's two exceptions.

The first exception to the Montana rule covers "activities of nonmembers who enter consensual relationships with the tribe or its members, through commercial dealing, contracts, leases, or other arrangements." 450 U. S., at 565. The tortious conduct alleged in Fredericks' complaint does not fit that description. The dispute, as the Court of Appeals said, is "distinctly non-tribal in nature." 76 F. 3d, at 940. It "arose between two non-Indians involved in [a] run-of-the-mill [highway] accident." Ibid. Although A–1 was engaged in subcontract work on the Fort Berthold Reservation, and therefore had a "consensual relationship" with the Tribes, "Gisela Fredericks was not a party to the subcontract, and the [T]ribes were strangers to the accident." Ibid.

Montana's list of cases fitting within the first exception, see 450 U. S., at 565–566, indicates the type of activities the Court had in mind: Williams v. Lee, 358 U. S. 217, 223 (1959) (declaring tribal jurisdiction exclusive over lawsuit arising out of on-reservation sales transaction between nonmember plaintiff and member defendants); Morris v. Hitchcock, 194 U. S. 384 (1904) (upholding tribal permit tax on nonmember-owned livestock within boundaries of the Chickasaw Nation); Buster v. Wright, 135 F. 947, 950 (CA8 1905) (upholding Tribe's permit tax on nonmembers for the privilege of conducting business within Tribe's borders; court characterized as "inherent" the Tribe's "authority . . . to prescribe the terms upon which noncitizens may transact business within its borders"); Colville, 447 U. S., at 152–154 (tribal authority to tax on-reservation cigarette sales to nonmembers "is a fundamental attribute of sovereignty which the tribes retain unless divested of it by federal law or necessary implication of their dependent status"). Measured against these cases, the Fredericks-Stockert highway accident presents no "consensual relationship" of the qualifying kind.

The second exception to Montana's general rule concerns conduct that "threatens or has some direct effect on the political integrity, the economic security, or the health or welfare of the tribe." 450 U. S., at 566. Undoubtedly, those who drive carelessly on a public highway running through a reservation endanger all in the vicinity, and surely jeopardize the safety of tribal members. But if Montana's second exception requires no more, the exception would severely shrink the rule. Again, cases cited in Montana indicate the character of the tribal interest the Court envisioned.

The Court's statement of Montana's second exceptional category is followed by citation of four cases, ibid.; each of those cases raised the question whether a State's (or Territory's) exercise of authority would trench unduly on tribal self-government. In two of the cases, the Court held that a State's exercise of authority would so intrude, and in two, the Court saw no impermissible intrusion.

The Court referred first to the decision recognizing the exclusive competence of a tribal court over an adoption proceeding when all parties belonged to the Tribe and resided on its reservation. See Fisher, 424 U. S., at 386; supra, at 12. Next, the Court listed a decision holding a tribal court exclusively competent to adjudicate a claim by a non-Indian merchant seeking payment from tribe members for goods bought on credit at an on-reservation store. See Williams, 358 U. S., at 220 ("[A]bsent governing Acts of Congress, the question [of state-court jurisdiction over on-reservation conduct] has always been whether the state action infringed on the right of reservation Indians to make their own laws and be ruled by them."). Thereafter, the Court referred to two decisions dealing with objections to a county or territorial government's imposition of a property tax on non-Indian-owned livestock that grazed on reservation land; in neither case did the Court find a significant tribal interest at stake. See Montana Catholic Missions v. Missoula County, 200 U. S. 118, 128–129 (1906) ("the Indians' interest in this kind of property [livestock], situated on their reservations, was not sufficient to exempt such property, when owned by private individuals, from [state or territorial] taxation"); Thomas v. Gay, 169 U. S. 264, 273 (1898) ("[territorial] tax put upon the cattle of [non-Indian] lessees is too remote and indirect to be deemed a tax upon the lands or privileges of the Indians").

Read in isolation, the Montana rule's second exception can be misperceived. Key to its proper application, however, is the Court's preface: "Indian tribes retain their inherent power [to punish tribal offenders,] to determine tribal membership, to regulate domestic relations among members, and to prescribe rules of inheritance for members. . . . But [a tribe's inherent power does not reach] beyond what is necessary to protect tribal self-government or to control internal relations." 450 U. S., at 564. Neither regulatory nor adjudicatory authority over the state highway accident at issue is needed to preserve "the right of reservation Indians to make their own laws and be ruled by them." Williams, 358 U. S., at 220. The Montana rule, therefore, and not its exceptions, applies to this case.

Gisela Fredericks may pursue her case against A–1 Contractors and Stockert in the state forum open to all who sustain injuries on North Dakota's highway. Opening the Tribal Court for her optional use is not necessary to protect tribal self-government; and requiring A–1 and Stockert to defend against this commonplace state highway accident claim in an unfamiliar court is not crucial to "the political integrity, the economic security, or the health or welfare of the [Three Affiliated Tribes]." Montana, 450 U. S., at 566.

* * *

For the reasons stated, the judgment of the Court of Appeals for the Eighth Circuit is

Affirmed.