450
Opinion of the Court
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.
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