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The Tenth Amendment to the United States Constitution, ratified on 15 December 1791 as part of the Bill of Rights, states: “The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.” The amendment addresses the vertical distribution of governmental authority within the American federal system, establishing a residual principle: powers not granted to the federal government and not denied to the states belong to the states or to the people themselves. Its scope and legal force have been subjects of ongoing constitutional dispute since the founding era.

The amendment emerged from Anti-Federalist concerns that the new Constitution created a central government with dangerously broad implied powers. Supporters of ratification - particularly those skeptical of the Articles of Confederation's explicit enumeration approach - agreed to include a declaratory amendment as part of the understanding that became the Bill of Rights. The word “expressly,” which had appeared in the Articles of Confederation's analogous provision, was deliberately omitted from the Tenth Amendment's text, a fact courts and scholars have cited on both sides of federalism disputes.

The amendment's legal significance has varied considerably across American history. The Supreme Court initially treated it as a truism - a declaration with no independent limiting force on federal power. During the New Deal era, after early resistance, the Court largely abandoned Tenth Amendment challenges to federal legislation. Beginning in the 1990s, the Court reasserted the amendment as a meaningful structural limit, prohibiting the federal government from “commandeering” state legislatures or executive officials to implement federal programs (see Tenth Amendment - History). Whether this revival represents a stable constitutional principle or a temporary doctrinal shift remains contested.

Contemporary debates center on three recurring questions: how broad the “necessary and proper” clause renders federal enumerated powers; whether the Commerce Clause, as interpreted, leaves any meaningful residual domain for the states; and whether the anti-commandeering doctrine adequately enforces the amendment's structural purpose. The amendment is frequently invoked in disputes over federal mandates, regulatory preemption, marijuana legalization, immigration enforcement cooperation, and firearms regulation, among others.

There is broad legal consensus that the Tenth Amendment imposes at least some structural limits on federal power, particularly through the anti-commandeering doctrine established in New York v. United States (1992) and Printz v. United States (1997). Significant disagreement persists among constitutional scholars and jurists regarding the amendment's broader scope and the degree to which it limits federal regulatory authority beyond commandeering. See Tenth Amendment - Legal Consensus.

Dual Federalism / State Sovereignty - Holds that the Tenth Amendment reserves a substantial, judicially enforceable domain of state authority immune from federal interference; the federal government is limited to its enumerated powers, narrowly construed. Read more.

Nationalist / Cooperative Federalism - Holds that the Tenth Amendment is largely a truism that adds nothing beyond what the structure of enumerated powers already implies; broad federal authority under the Commerce and Necessary and Proper Clauses is consistent with the amendment. Read more.

Popular Sovereignty Reading - Emphasizes the amendment's reservation of power to “the people” as distinct from state governments; stresses individual and collective rights not reducible to state-versus-federal competition. Read more.

Nullification and Interposition - Holds that states retain authority to refuse enforcement of, or formally oppose, federal laws they deem unconstitutional; historically associated with John C. Calhoun and intermittently revived in various forms. Rejected by mainstream legal opinion but advocated in some conservative and libertarian circles. Read more.

• Tenth Amendment - History
• Tenth Amendment - Debate
• Tenth Amendment - Legal Consensus
• Bill of Rights
• Federalism
• Enumerated Powers
• Commerce Clause
• Necessary and Proper Clause
• Anti-Commandeering Doctrine
• Nullification
• Articles of Confederation

1. U.S. Const. amend. X.
2. Articles of Confederation art. II (1781): “Each state retains its sovereignty, freedom, and independence, and every power, jurisdiction, and right, which is not by this Confederation expressly delegated to the United States, in Congress assembled.”
3. McCulloch v. Maryland, 17 U.S. (4 Wheat.) 316 (1819) (treating the Tenth Amendment as consistent with broad implied federal powers).
4. United States v. Darby, 312 U.S. 100, 124 (1941) (“The amendment states but a truism that all is retained which has not been surrendered.”).
5. New York v. United States, 505 U.S. 144 (1992).
6. Printz v. United States, 521 U.S. 898 (1997).
7. United States v. Lopez, 514 U.S. 549 (1995) (first Commerce Clause limitation since 1937).
8. Kurt T. Lash, The Original Meaning of an Omission: The Tenth Amendment, Popular Sovereignty, and Expressly Delegated Power, 83 Notre Dame L. Rev. 1889 (2008).