412
Opinion of the Court
derstanding that the boundary disputes should be resolved on the merits. See 460 U. S., at 634 ("[The State parties] argued . . . that the boundary controversies were ripe for judicial review, and they urged the Special Master to receive evidence, hear legal arguments, and resolve each of the boundary disputes, but only for the limited purpose of establishing additional Indian water rights, if any."); Report of Special Master Tuttle, O. T. 1981, No. 8 Orig., p. 57 (describing the State parties' contention "that the boundaries [of all five reservations] have not been finally determined and that I should make a de novo determination of the boundaries for recommendation to the Court"). As late as 1988, the State parties asked the Court to appoint a new Special Master and direct him "to conclude his review of the boundary issues as expeditiously as possible and to submit a recommended decision to the Court." Brief for Petitioners in California v. United States, O. T. 1987, No. 87-1165, p. 49.
Finally, the State parties argue that even if they earlier failed to raise the preclusion defense, this Court should raise it now sua sponte. Judicial initiative of this sort might be appropriate in special circumstances. Most notably, "if a court is on notice that it has previously decided the issue presented, the court may dismiss the action sua sponte, even though the defense has not been raised. This result is fully consistent with the policies underlying res judicata: it is not based solely on the defendant's interest in avoiding the burdens of twice defending a suit, but is also based on the avoidance of unnecessary judicial waste." United States v. Sioux Nation, 448 U. S. 371, 432 (1980) (Rehnquist, J., dissenting) (citations omitted). That special circumstance is not present here: While the State parties contend that the Fort Yuma boundary dispute could have been decided in Arizona I, this Court plainly has not "previously decided the issue presented." Therefore we do not face the prospect of redoing a matter once decided. Where no judicial resources have been spent on the resolution of a question, trial courts must
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