450
Opinion of the Court
presentation of issues upon which the court so largely depends for illumination of difficult constitutional questions.' Baker v. Carr, [369 U. S. 186, 204 (1962)]; see also NAACP v. Alabama ex rel. Patterson, 357 U. S. 449, 459-460 (1958)." Id., at 345.
That the commission was allowed to proceed in Hunt necessarily supports Wyoming's standing against Oklahoma, where its severance tax revenues are directly linked to the extraction and sale of coal and have been demonstrably affected by the Act.
Over Oklahoma's objection, which is repeated here, the Special Master also concluded that this case was an appropriate one for the exercise of our original jurisdiction. We agree, and we obviously shared this thought when granting Wyoming leave to file its complaint in the first instance. We have generally observed that the Court's original jurisdiction should be exercised "sparingly," Maryland v. Louisiana, 451 U. S., at 739; United States v. Nevada, 412 U. S. 534, 538 (1973), and this Court applies discretion when accepting original cases, even as to actions between States where our jurisdiction is exclusive. As stated not long ago:
"In recent years, we have consistently interpreted 28 U. S. C. § 1251(a) as providing us with substantial discretion to make case-by-case judgments as to the practical necessity of an original forum in this Court for particular disputes within our constitutional original jurisdiction. See Maryland v. Louisiana, 451 U. S. 725, 743 (1981); Ohio v. Wyandotte Chemicals Corp., 401 U. S. 493, 499 (1971). We exercise that discretion with an eye to promoting the most effective functioning of this Court within the overall federal system." Texas v. New Mexico, 462 U. S. 554, 570 (1983).
Specifically, we have imposed prudential and equitable limitations upon the exercise of our original jurisdiction, and of these limitations we have said:
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