Cite as: 530 U. S. 392 (2000)
Opinion of Rehnquist, C. J.
the facts that it later asserted in 1979 in Arizona II, and it could have litigated the larger claim before Special Master Rifkind.
The United States offers no support for its contention that the boundary dispute could not have been decided in Arizona I except for the fact that this Court rejected the Master's resolution of the Fort Mojave Reservation and Colorado River Reservation boundary disputes. However, those boundary disputes are different. While we did not explain in Arizona I why we believed it was improper to decide the boundary disputes, California's objection was based on the fact that necessary parties were not participating in the proceedings. Specifically, California argued that it lacked the authority to represent private individuals claiming title to the disputed lands and maintained that "it would be unfair to prejudice any of the parties in future litigation over land titles or political jurisdiction by approving findings on a tangential issue never pleaded by the United States." Arizona II, supra, at 629. The Fort Yuma Reservation boundary dispute, on the other hand, is solely between the United States and the Quechan Tribe—there are no private parties claiming title to the land. Thus, the United States could have raised this claim in Arizona I, and the Master could have decided it.
Because I believe that the State parties' res judicata defense is properly before the Court and that the United States' claim for additional water rights is precluded, I see no need to remand for further proceedings. I agree with the Court that we should approve the proposed settlements of the remaining claims in this case and direct the parties to submit any objections to the proposed supplemental decree.
427
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