156
Opinion of the Court
thority, 469 U. S. 528 (1985); Lane County v. Oregon, 7 Wall. 71 (1869). In a case like these, involving the division of authority between federal and state governments, the two inquiries are mirror images of each other. If a power is delegated to Congress in the Constitution, the Tenth Amendment expressly disclaims any reservation of that power to the States; if a power is an attribute of state sovereignty reserved by the Tenth Amendment, it is necessarily a power the Constitution has not conferred on Congress. See United States v. Oregon, 366 U. S. 643, 649 (1961); Case v. Bowles, 327 U. S. 92, 102 (1946); Oklahoma ex rel. Phillips v. Guy F. Atkinson Co., 313 U. S. 508, 534 (1941).
It is in this sense that the Tenth Amendment "states but a truism that all is retained which has not been surrendered." United States v. Darby, 312 U. S. 100, 124 (1941). As Justice Story put it, "[t]his amendment is a mere affirmation of what, upon any just reasoning, is a necessary rule of interpreting the constitution. Being an instrument of limited and enumerated powers, it follows irresistibly, that what is not conferred, is withheld, and belongs to the state authorities." 3 J. Story, Commentaries on the Constitution of the United States 752 (1833). This has been the Court's consistent understanding: "The States unquestionably do retai[n] a significant measure of sovereign authority . . . to the extent that the Constitution has not divested them of their original powers and transferred those powers to the Federal Government." Garcia v. San Antonio Metropolitan Transit Authority, supra, at 549 (internal quotation marks omitted).
Congress exercises its conferred powers subject to the limitations contained in the Constitution. Thus, for example, under the Commerce Clause Congress may regulate publishers engaged in interstate commerce, but Congress is constrained in the exercise of that power by the First Amendment. The Tenth Amendment likewise restrains the power of Congress, but this limit is not derived from the text of the Tenth Amendment itself, which, as we have discussed,
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