Tenth Amendment

Introduction

The Tenth Amendment provides: “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.” Ratified in 1791 as part of the Bill of Rights, the Tenth Amendment is a foundational provision of American federalism. It confirms that the federal government is one of enumerated powers and that all powers not delegated to it nor prohibited to the states remain with the states or the people. The amendment serves as a constitutional axiom defining the structure of American government rather than an affirmative grant of authority.

The Tenth Amendment was largely declaratory of principles already inherent in the Constitution’s structure. The Constitution enumerates specific federal powers in Article I, Section 8 and elsewhere; the Tenth Amendment confirms that this enumeration exhausts federal authority. The amendment was added to address Anti-Federalist concerns that the new federal government might claim powers beyond those delegated, and to ensure that state sovereignty would be preserved.

The Enumerated Powers Principle

The Tenth Amendment embodies the enumerated powers principle: the federal government possesses only those powers delegated to it by the Constitution, while states possess all powers not prohibited to them. This structural limitation is fundamental to American federalism. When Congress enacts legislation, courts must determine whether it falls within one of Congress’s enumerated powers, such as the Commerce Clause, the Taxing Power, or the Necessary and Proper Clause.

The Supreme Court has applied the Tenth Amendment to invalidate federal laws that commandeer state governments. In New York v. United States (1992), the Court struck down a federal law requiring states to take title to low-level radioactive waste if they failed to provide for its disposal. The Court held that Congress may not commandeer state legislative processes by directly compelling states to enact and enforce federal regulatory programs.

In Printz v. United States (1997), the Court extended the anti-commandeering principle to state executive officials, invalidating provisions of the Brady Handgun Violence Prevention Act that required state and local law enforcement officers to conduct background checks on handgun purchasers. The Court held that Congress may not impress state executive officers into federal service.

The Anti-Commandeering Doctrine

The anti-commandeering doctrine is the most significant Tenth Amendment limitation on federal power. Under this doctrine, Congress may not require state legislatures or executive officials to adopt or enforce federal regulatory programs. The doctrine preserves state sovereignty by preventing the federal government from treating states as administrative subunits.

The doctrine does not prohibit Congress from conditioning federal funding on state compliance with federal requirements, imposing direct federal regulation that preempts state law, or offering states choices between regulatory options. In New York, the Court distinguished between commandeering (which is prohibited) and offering states a choice between complying with federal requirements and accepting the consequences (which is permitted).

The anti-commandeering doctrine has been applied in the context of immigration, environmental regulation, and healthcare. In NFIB v. Sebelius (2012), the Court held that the Affordable Care Act’s Medicaid expansion violated the Tenth Amendment by threatening to withdraw all Medicaid funding from states that refused to participate, constituting coercion rather than a legitimate exercise of the spending power.

State Police Powers

The Tenth Amendment reserves to states their traditional police powers — the authority to regulate for the health, safety, welfare, and morals of their citizens. State police powers encompass criminal law, public health regulation, land use control, education, family law, professional licensing, and the regulation of businesses and occupations. The Supreme Court has recognized that the police power is an inherent attribute of state sovereignty, not a grant from the federal government.

States also retain authority over election administration, property law, contract law, tort law, and the structure of state and local government. State constitutions may provide greater protections for individual rights than the federal Constitution, and state courts are the final arbiters of state law.

The Tenth Amendment and Commerce Clause Limits

The Tenth Amendment has intersected with Commerce Clause jurisprudence in cases challenging the scope of federal regulatory authority. In United States v. Lopez (1995), the Court invalidated the Gun-Free School Zones Act, holding that possession of a firearm near a school was not economic activity substantially affecting interstate commerce. The Court emphasized that the federal government is one of enumerated powers and that the Tenth Amendment confirms the structural limitation on federal authority.

In United States v. Morrison (2000), the Court struck down the civil remedy provision of the Violence Against Women Act, holding that gender-motivated violence is not economic activity and that Congress may not regulate non-economic criminal conduct based on its aggregate effect on interstate commerce. The Court’s analysis was informed by the constitutional structure confirmed by the Tenth Amendment.

The Spending Power and State Sovereignty

Congress’s spending power — the power to attach conditions to federal grants to states — is limited by the Tenth Amendment. Conditions must be unambiguous, related to the federal interest, and not unduly coercive. In South Dakota v. Dole (1987), the Court upheld a federal law withholding highway funding from states that did not raise their minimum drinking age to twenty-one, applying a four-part test requiring conditions to be in pursuit of the general welfare, unambiguous, related to the federal interest, and not independently unconstitutional, with the additional limitation that the financial inducement must not be coercive.

In NFIB v. Sebelius (2012), the Court held for the first time that a spending condition was unconstitutionally coercive. The Affordable Care Act’s threat to withdraw all existing Medicaid funding — representing approximately ten percent of most state budgets — if states refused to expand Medicaid constituted impermissible coercion. The Court distinguished Dole, noting that the threatened loss was far more substantial and that the expansion represented a fundamental transformation of the Medicaid program.

Conclusion

The Tenth Amendment confirms the constitutional structure of enumerated federal powers and residual state sovereignty. While the amendment was long viewed as a truism rather than an independent source of law, the Supreme Court has given it substantive content through the anti-commandeering doctrine and related federalism principles. The amendment continues to inform constitutional debates about the limits of federal power, the scope of state autonomy, and the proper balance between national uniformity and state diversity in the American federal system.