The Tenth Amendment to the United States Constitution reserves to the states and the people all powers not delegated to the federal government by the Constitution and not prohibited to the states. Within the American legal community - federal courts, constitutional law scholarship, and practicing constitutional litigators - a partial consensus exists regarding the amendment's legal force. That consensus is narrowest and most stable at the doctrinal level: the anti-commandeering principle is broadly accepted as settled law. It is substantially weaker, and actively contested, on the broader question of whether the amendment imposes meaningful independent limits on federal regulatory power beyond commandeering. No consensus exists on originalist questions about the amendment's intended scope.

The Supreme Court treated the Tenth Amendment as essentially declaratory for most of the twentieth century. In United States v. Darby (1941), the Court held that the amendment “states but a truism that all is retained which has not been surrendered,” a formulation that effectively deprived it of independent limiting force.¹⁾ This characterization prevailed through the New Deal and Warren Court eras.

Beginning in 1992, the Court reasserted the amendment as a structural limit through what became the anti-commandeering doctrine. In New York v. United States, the Court held that Congress may not compel state legislatures to enact or administer federal regulatory programs.²⁾ In Printz v. United States, it extended this prohibition to state executive officials, invalidating a provision of the Brady Handgun Violence Prevention Act that required local law enforcement to conduct background checks.³⁾ These holdings have not been overturned and have been reaffirmed and applied in subsequent decisions, including Murphy v. National Collegiate Athletic Association (2018), which struck down a federal statute prohibiting states from authorizing sports gambling.⁴⁾

Within the federal judiciary, the anti-commandeering rule is now treated as settled constitutional law. Lower federal courts apply it without significant doctrinal resistance. This represents the strongest and most durable layer of Tenth Amendment consensus.

The related but distinct question of whether the amendment limits the scope of federal regulatory power - as opposed to the means of its enforcement - remains contested at the judicial level. In United States v. Lopez (1995) and United States v. Morrison (2000), the Court imposed limits on the Commerce Clause for the first time since 1937, striking down federal statutes as exceeding enumerated powers.⁵⁾⁶⁾ In National Federation of Independent Business v. Sebelius (2012), five justices agreed that the Commerce Clause did not authorize the Affordable Care Act's individual mandate, though the mandate was ultimately upheld under the taxing power.⁷⁾ These cases do not consistently invoke the Tenth Amendment as their primary doctrinal basis, but they reflect an ongoing judicial project of enforcing enumerated-powers limits that intersects with Tenth Amendment structural claims. No stable majority consensus exists on how far that project extends.

Legal scholars broadly agree that the anti-commandeering cases represent a genuine and durable doctrinal revival, not merely a temporary deviation. Disagreement is substantial, however, on three questions.

First, whether the amendment has independent operative force or merely reflects what the enumerated-powers structure already implies. Scholars in the nationalist tradition - associated with figures such as Jack Balkin and Erwin Chemerinsky - treat the amendment as a structural reminder rather than an independent source of judicially enforceable limits. Scholars in the dual federalism and state sovereignty traditions - including Akhil Amar (on selective points), Randy Barnett, and Kurt Lash - attribute more independent content to the amendment, though they disagree among themselves about its original meaning.

Second, the significance of the deliberate omission of the word “expressly” from the Tenth Amendment's text, which had appeared in the analogous provision of the Articles of Confederation.⁸⁾ Some scholars treat the omission as confirming that implied federal powers are consistent with the amendment. Others argue it reflects a different structural principle - popular sovereignty rather than state sovereignty - that cuts against both nationalist and dual-federalism readings.

Third, whether the Rehnquist and Roberts Courts' federalism decisions constitute a coherent and stable constitutional principle or an ideologically contingent doctrinal oscillation. The post-Lopez line has not produced a clear limiting principle capable of distinguishing permissible from impermissible federal regulation, a point noted by critics across methodological traditions.

There is no scholarly consensus on these questions. The anti-commandeering rule is the only area where something approaching broad doctrinal agreement exists.

Among policy advocates, state attorneys general, and litigators who regularly invoke the Tenth Amendment, there is operational consensus that the anti-commandeering doctrine is available and useful as a litigation tool - as demonstrated by successful challenges to federal marijuana enforcement cooperation requirements, immigration detainer mandates, and sports gambling restrictions. There is no consensus on how far the doctrine extends to novel regulatory contexts.

The following questions are genuinely open within the relevant expert communities:

Scope of the anti-commandeering doctrine. Murphy (2018) raised but did not resolve whether the doctrine applies to federal statutes that “preempt” state law by prohibiting states from acting, as distinct from commandeering states to enforce federal law. The boundary between permissible preemption and impermissible commandeering is unsettled.⁹⁾

The “people” reservation. The amendment reserves powers to “the States respectively, or to the people.” Courts have not developed a consistent jurisprudence around what the reservation to “the people” independently means or protects, as distinct from the reservation to states. This is an active area of scholarly debate.

Commerce Clause residuum. Whether, after Gonzales v. Raich (2005) - which upheld federal prohibition of locally grown, non-commercial marijuana - any meaningful domain of intrastate activity remains beyond Commerce Clause reach is unresolved.¹⁰⁾ Lopez and Morrison have not been overruled, but their limiting principle has not been clearly defined by subsequent decisions.

Originalist disagreement. Scholars working within originalist frameworks disagree about whether the original public meaning of the amendment tracks a state sovereignty reading, a popular sovereignty reading, or something closer to the truism interpretation. This disagreement has not been resolved and bears on how the amendment should develop under originalist jurisprudence.

Conditional spending. The Court has recognized in principle that federal conditions on grants to states can become unconstitutionally “coercive,” but has applied this limit in only one case (NFIB v. Sebelius, regarding the Medicaid expansion). The standard for coercion remains undefined in practice.¹¹⁾

The following viewpoints challenge aspects of the prevailing legal consensus or its application and are documented separately:

• Dual Federalism / State Sovereignty - argues the consensus understates the amendment's limiting force and that the Court has failed to enforce it adequately.
• Nationalist / Cooperative Federalism - argues the post-1992 anti-commandeering doctrine is judicially invented, inconsistent with the amendment's original declaratory purpose, and has produced incoherent results.
• Popular Sovereignty Reading - argues that the legal consensus, by focusing on state-versus-federal competition, neglects the amendment's reservation to “the people” and its implications for individual rights.
• Nullification and Interposition - argues that states retain authority to refuse enforcement of unconstitutional federal laws, a position rejected by mainstream federal courts but advocated in some conservative and libertarian circles.

• Tenth Amendment - main topic page
• Tenth Amendment - History
• Tenth Amendment - Debate
• Federalism
• Anti-Commandeering Doctrine
• Commerce Clause
• Necessary and Proper Clause
• Enumerated Powers
• Nullification
• Bill of Rights