Cite as: 521 U. S. 261 (1997)
Opinion of Kennedy, J.
solved in state courts where Eleventh Amendment immunity would be applicable in federal court but for an exception based on Young. For purposes of the Supremacy Clause, it is simply irrelevant whether the claim is brought in state or federal court. Federal courts, after all, did not have general federal-question jurisdiction until 1875. Assuming the availability of a state forum with the authority and procedures adequate for the effective vindication of federal law, due process concerns would not be implicated by having state tribunals resolve federal-question cases.
In some cases, it is true, the federal courts play an indispensable role in maintaining the structural integrity of the constitutional design. A federal forum assures the peaceful resolution of disputes between the States, South Dakota v. North Carolina, 192 U. S. 286 (1904), and suits initiated by the United States against States, United States v. Texas, 143 U. S. 621 (1892). While we can assume there is a special role for Article III courts in the interpretation and application of federal law in other instances as well, we do not for that reason conclude that state courts are a less than adequate forum for resolving federal questions. A doctrine based on the inherent inadequacy of state forums would run counter to basic principles of federalism. In Stone v. Powell, 428 U. S. 465 (1976), we expressed our "emphatic reaffirmation . . . of the constitutional obligation of the state courts to uphold federal law, and [our] expression of confidence in their ability to do so." Allen v. McCurry, 449 U. S. 90, 105 (1980).
Interpretation of federal law is the proprietary concern of state, as well as federal, courts. It is the right and duty of the States, within their own judiciaries, to interpret and to follow the Constitution and all laws enacted pursuant to it, subject to a litigant's right of review in this Court in a proper case. The Constitution and laws of the United States are not a body of law external to the States, acknowledged and enforced simply as a matter of comity. The Constitution is
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