which shall be made in Pursuance thereof . . . shall be the supreme Law of the Land.” U. S. Const., Art. VI, cl. 2. James Madison felt that a constitution without this Clause “would have been evidently and radically defective.” The Federalist No. 44, p. 286 (C. Rossiter ed. 1961). The ratification of the Fourteenth Amendment by the citizens of the several States expanded federal powers even further, with a corresponding diminution of state sovereignty. See Fitzpatrick v. Bitzer, 427 U. S. 445, 453-456 (1976); Ex parte Virginia, 100 U. S. 339, 344-348 (1880). Thus, “the sovereignty of the States is limited by the Constitution itself.” Garcia v. San Antonio Metropolitan Transit Authority, 469 U. S. 528, 548 (1985).
Federal habeas review of state-court judgments, respectfully employed to safeguard federal rights, is no invasion of state sovereignty. Cf. Ex parte Virginia, 100 U. S., at 346. Since 1867, Congress has acted within its constitutional authority to “ ‘interpose the federal courts between the States and the people, as guardians of the people’s federal rights — to protect the people from unconstitutional action.’” Reed v. Ross, 468 U. S. 1, 10 (1984), quoting Mitchum v. Foster, 407 U. S. 225, 242 (1972). See 28 U. S. C. § 2254. Justice Frankfurter, in his separate opinion in Brown v. Allen, 344 U. S. 443, 510 (1953), recognized this:
“Insofar as [federal habeas] jurisdiction enables federal district courts to entertain claims that State Supreme Courts have denied rights guaranteed by the United States Constitution, it is not a case of a lower court sitting in judgment on a higher court. It is merely one aspect of respecting the Supremacy Clause of the Constitution whereby federal law is higher than State law.”
Thus, the considered exercise by federal courts — in vindication of fundamental constitutional rights — of the habeas jurisdiction conferred on them by Congress exemplifies the full expression of this Nation’s federalism.