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Tenth Amendment - Debate
The Tenth Amendment to the United States Constitution1) reserves to the states and the people all powers neither delegated to the federal government nor prohibited to the states. Its text is brief and its ratification history is well-documented, yet the amendment has generated sustained constitutional controversy from the founding era to the present. The core dispute is not whether the amendment means something, but what it means and how much legal force it carries: whether it imposes a judicially enforceable limit on federal power, functions as a largely declaratory structural principle, primarily protects individual and popular rights rather than state prerogatives, or even licenses state resistance to federal law. These questions bear directly on contested policy domains including federal regulatory authority, unfunded mandates, drug enforcement, immigration, and firearms law.
The Amendment Is a Meaningful, Judicially Enforceable Limit on Federal Power
Proponents of what is often called dual federalism or state sovereignty argue that the Tenth Amendment does real constitutional work beyond merely restating the structure of enumerated powers. On this reading, the federal government possesses only the specific powers the Constitution grants it, and those grants must be construed with reference to the residual authority the amendment explicitly preserves for the states and the people. The deliberate omission of the word “expressly” - present in the analogous provision of the Articles of Confederation2) - does not, on this view, authorize sweeping implied powers; it simply acknowledges that incidental means necessary to carry out enumerated ends remain available, while leaving a genuine reserved domain beyond federal reach.
Advocates point to the Supreme Court's post-1990s federalism revival as recognition of this principle in practice. In New York v. United States (1992) and Printz v. United States (1997), the Court held that the federal government may not commandeer state legislatures or executive officials to implement federal programs - a structural limit the majority grounded in the Constitution's vertical separation of powers and the Tenth Amendment's reservation of state authority.3) In United States v. Lopez (1995) and United States v. Morrison (2000), the Court further held that the Commerce Clause does not extend to all economic activity, implying that some domain of regulation belongs to the states alone.4)
On this view, a Tenth Amendment with no independent limiting force is not a constitutional provision at all - it is dead letter. Treating it as a truism renders the amendment surplusage, violating the canon that every constitutional text should be given effect. If the enumerated powers already defined the federal government's limits, there was no reason to include the amendment; its inclusion signals a commitment to genuine reserved state authority.
The Amendment Is Largely Declaratory and Does Not Restrict Broad Federal Regulatory Power
The competing nationalist or cooperative federalism position holds that the Tenth Amendment adds no substantive restriction beyond what follows from the structure of enumerated powers. On this reading, the amendment is a truism: whatever has not been delegated remains with the states, but the scope of what has been delegated is determined by other provisions - primarily the Commerce Clause and the Necessary and Proper Clause - and those provisions, properly read, authorize a wide range of federal regulation.
The Supreme Court articulated this position explicitly in United States v. Darby (1941), characterizing the amendment as stating “but a truism that all is retained which has not been surrendered.”5) On this account, the omission of “expressly” from the Tenth Amendment, in contrast to the Articles of Confederation, was deliberate and significant: the framers rejected strict enumeration in favor of a government capable of addressing national problems through implied as well as explicit powers, as confirmed by McCulloch v. Maryland (1819).6)
Proponents of this view argue that the federalism revival of the 1990s, while real, has been modest in practical effect. The anti-commandeering doctrine prohibits one specific mechanism of federal coercion but leaves intact the broad scope of conditional spending, direct federal regulation, and preemption. The Commerce Clause decisions in Lopez and Morrison have produced limited further restrictions in subsequent case law. On this reading, the Tenth Amendment is best understood as confirming the federal government's character as one of limited and enumerated powers without itself providing a judicially manageable standard for policing those limits beyond what the text of specific grants allows.
The Amendment Primarily Protects Popular Sovereignty, Not State Government Authority
A third position, associated with the popular sovereignty reading, emphasizes the amendment's reservation of power to “the people” as a distinct and underappreciated element of its text. On this view, the conventional debate between state sovereignty and nationalist federalism focuses on the wrong axis: both positions treat the amendment primarily as allocating authority between state governments and the federal government, neglecting the amendment's explicit reference to the people as a separate rights-holding entity.
Scholars in this tradition, drawing on founding-era debates and the ratification history of the Bill of Rights, argue that the amendment was understood to protect popular rights and liberties against governmental overreach at every level - not merely to preserve state legislative authority. The Anti-Federalist demand for a bill of rights was driven largely by concern for individual and community liberty, not by an interest in empowering state governments as such. On this reading, the Tenth Amendment supports arguments for individual autonomy and against both federal and state encroachments on rights retained by the people - a framing with implications distinct from either the dual federalism or nationalist positions.7)
States May Refuse to Enforce or May Formally Oppose Unconstitutional Federal Laws
The nullification and interposition position holds that the Tenth Amendment, read in light of the Constitution's structure and the founding-era compact theory of union, authorizes or requires states to refuse enforcement of federal laws they judge to exceed constitutional limits. Associated historically with the Virginia and Kentucky Resolutions of 1798-1799 and later with John C. Calhoun's antebellum writings, this position holds that the states, as parties to the constitutional compact, retain authority to judge federal overreach and to interpose their authority against it.
Contemporary advocates, primarily in conservative and libertarian circles, invoke versions of this argument in debates over federal marijuana policy, firearms regulation, and immigration enforcement cooperation. They argue that the anti-commandeering doctrine - which the Supreme Court has sustained - represents a partial judicial recognition of the same underlying principle: states cannot be conscripted into implementing federal programs, which implies a reserved domain of state authority that the federal government cannot override. On this view, state non-cooperation with federal enforcement priorities is not merely permissible but may be constitutionally grounded in the Tenth Amendment's reservation clause.
Critics note that the Supreme Court has consistently rejected nullification as a legal doctrine since Cooper v. Aaron (1958) reaffirmed federal judicial supremacy in constitutional interpretation, and that the Confederacy's invocation of state sovereignty arguments during the Civil War period discredited the doctrine in mainstream constitutional law.8) Proponents respond that judicial supremacy itself is contested and that the Court's rejection of nullification is not self-validating as a matter of constitutional first principles.
Points of Agreement
Across these competing positions, there is broad agreement on several points. The Tenth Amendment's text is genuine constitutional law, not a hortatory preamble. The federal government is a government of limited and enumerated powers, not plenary national authority - a structural principle accepted even by nationalist federalism proponents. The anti-commandeering doctrine, as articulated in New York and Printz, represents settled law and is not seriously contested in mainstream constitutional debate. The deliberate omission of “expressly” from the amendment's text, compared to the Articles of Confederation, is a relevant datum in interpreting its scope, though interpreters draw contrary conclusions from it.