Cooperative federalism, as applied to the Tenth Amendment, holds that the amendment is best understood not as a barrier between federal and state authority but as a structural principle compatible with-and even supportive of-collaborative intergovernmental arrangements. Advocates of this view argue that the Constitution permits, and in many circumstances requires, federal and state governments to work together in administering shared regulatory programs, with the Tenth Amendment functioning as a background norm of residual state authority rather than a hard jurisdictional wall. This viewpoint is associated with progressive and moderate constitutional scholars, New Deal and post-New Deal legal theorists, and practitioners of administrative federalism. It stands in explicit contrast to the Tenth Amendment - Dual Federalism Viewpoint, which insists on strictly separated sovereign spheres, and to the Tenth Amendment - Nationalist Federalism Viewpoint, which tends to minimize the Tenth Amendment's independent legal force altogether.

The Tenth Amendment reserves, but does not isolate. Cooperative federalism proponents hold that the word “reserved” in the Tenth Amendment signals that states retain authority not already delegated to the federal government, but that this reservation does not prevent states and the federal government from occupying the same regulatory space simultaneously. The Supremacy Clause, the Necessary and Proper Clause, and the Spending Clause each presuppose a federal system in which the two levels of government interact, overlap, and negotiate. On this reading, the Tenth Amendment confirms the existence of state sovereignty without mandating its insulation.

Historical practice confirms intergovernmental cooperation. Advocates argue that cooperative federalism is not a modern invention but tracks a long tradition of joint administration stretching from early land grant arrangements, the Morrill Act land-grant colleges (1862), and joint railroad regulation through the twentieth century's cooperative programs in unemployment insurance, Medicaid, environmental regulation, and highway funding. The amendment, they contend, was ratified in a political culture already accustomed to intergovernmental collaboration, and its framers did not intend to prohibit it.

The Tenth Amendment imposes anti-commandeering limits, not anti-cooperation limits. Cooperative federalism advocates generally accept the anti-commandeering doctrine articulated in New York v. United States (1992) and Printz v. United States (1997) as a genuine constitutional constraint: Congress may not conscript state legislatures or executive officers to administer federal programs. But they distinguish commandeering-coercive conscription-from voluntary cooperative federalism, in which states choose to participate in federal programs in exchange for funding or regulatory authority. The Tenth Amendment, on this view, protects states' ability to opt out, not their immunity from choosing to participate.

Conditional spending and preemption are legitimate federal tools. Proponents contend that Congress may attach conditions to federal funds, and that states that accept those funds consent to the accompanying regulatory framework. So long as conditions are clearly stated and do not rise to the level of unconstitutional coercion-the threshold explored in NFIB v. Sebelius (2012)-spending-based cooperative programs are consistent with the Tenth Amendment. Similarly, the Supremacy Clause authorizes federal preemption, but cooperative federalism advocates argue that “cooperative preemption” schemes, which allow states to adopt their own standards meeting or exceeding federal floors, honor state sovereignty while advancing national regulatory goals.

Federalism as process, not just structure. Many cooperative federalism theorists argue that the animating concern behind the Tenth Amendment-preventing federal tyranny and preserving democratic self-governance-is better served by states actively participating in federal programs, with their own administrative capacity and political accountability, than by rigid jurisdictional separation that may leave regulatory gaps. They hold that states functioning as laboratories of democracy within cooperative schemes fulfill the amendment's underlying purpose.

The cooperative federalism model developed primarily in the twentieth century as the administrative state expanded, though its intellectual precursors appear earlier. The landmark New Deal programs of the 1930s-particularly unemployment insurance under the Social Security Act of 1935, which employed a tax-offset device to induce state participation-crystallized the cooperative model. Legal academics and New Deal policymakers argued that the Constitution's federal structure was not broken by these arrangements but rather fulfilled through them.

The constitutional foundation was reinforced in Steward Machine Co. v. Davis (1937), in which the Supreme Court upheld the unemployment insurance scheme, with Justice Benjamin Cardozo's majority opinion holding that the collaboration between federal and state governments in addressing a national economic crisis was consistent with the constitutional design. The Court's abandonment of dual federalism's rigid categorical approach in cases like United States v. Darby (1941) and Wickard v. Filburn (1942) cleared doctrinal space for cooperative arrangements.

Academic consolidation followed. Morton Grodzins's influential metaphor of the “marble cake” rather than the “layer cake” in his 1966 book The American System captured the cooperative federalism view vividly: federal and state authority, he argued, had always been intermingled, and the goal of clean separation was both historically false and administratively counterproductive. Daniel Elazar, his student and collaborator, extended the analysis across American political history, identifying patterns of intergovernmental partnership from the founding era forward.

The late twentieth century saw partial judicial retrenchment. New York v. United States (1992) and Printz v. United States (1997) imposed the anti-commandeering rule, which cooperative federalism theorists largely accommodated by distinguishing compulsion from cooperation. NFIB v. Sebelius (2012) raised the question of at what point financial inducement becomes unconstitutional coercion, producing a fractured Court opinion that cooperative federalism scholars have since debated as the outer boundary of permissible conditioned spending.

Morton Grodzins (1917-1964) - Political scientist at the University of Chicago whose work on the “marble cake” model of federalism provided the conceptual vocabulary for cooperative federalism. His posthumous The American System (1966) remains a foundational text.

Daniel Elazar (1934-1999) - Scholar of American federalism whose historical research traced cooperative intergovernmental arrangements to the colonial and founding periods, arguing that they were constitutionally indigenous rather than modern departures.

Justice Benjamin Cardozo (1870-1938) - Author of the Steward Machine majority opinion, which provided early constitutional legitimation for cooperative spending arrangements and rejected the claim that federal-state collaboration was inherently coercive or unconstitutional.

Erwin Chemerinsky (b. 1953) - Constitutional law scholar and dean who has written extensively in support of broad federal power and criticized the Rehnquist Court's federalism revival as historically unsupported and practically harmful. His treatise Constitutional Law: Principles and Policies articulates the cooperative model.

Pamela S. Karlan (b. 1959) - Legal scholar whose work on the enforcement clauses of the Reconstruction Amendments and congressional power supports a broad reading of federal authority compatible with cooperative intergovernmental arrangements.

Justice John Paul Stevens (1920-2019) - Frequent dissenter in the Rehnquist Court's federalism decisions, Stevens argued that the majority's anti-commandeering and state sovereign immunity holdings misread the Constitution's history and structure and impeded legitimate cooperative governance.

Cooperative federalism proponents are not unanimous on the coercion question. The NFIB v. Sebelius ruling-in which seven justices agreed that the Affordable Care Act's Medicaid expansion, as originally written, was unconstitutionally coercive-divided cooperative federalism scholars on where the line between inducement and compulsion should fall. Some argue that the coercion doctrine, while theoretically sound, should have an extremely high threshold and should rarely if ever invalidate spending conditions; others accept a more robust coercion limit as a genuine protection of state sovereignty within the cooperative model.

There is also internal disagreement about the proper scope of preemption. Some cooperative federalism theorists are skeptical of broad implied preemption doctrines, arguing that courts should require Congress to speak clearly before displacing state law, as this preserves states' collaborative role. Others are more comfortable with implied preemption where federal regulatory goals require uniformity.

A further debate concerns asymmetric federalism-whether states should be permitted to impose stricter standards than federal floors (as California has done in environmental regulation) or whether national uniformity concerns should limit state departures upward as well as downward. Most cooperative federalism scholars favor allowing state experimentation above federal floors, but the normative and practical limits of this position are contested.

• Tenth Amendment
• Tenth Amendment - Dual Federalism Viewpoint
• Tenth Amendment - Nationalist Federalism Viewpoint
• Tenth Amendment - History
• Tenth Amendment - Anti-Commandeering Debate
• Cooperative Federalism - History
• Spending Clause Coercion Controversy
• NFIB v. Sebelius - Federalism Debate

1. Morton Grodzins, The American System: A New View of Government in the United States, ed. Daniel J. Elazar (Chicago: Rand McNally, 1966), 8-9. 2. Daniel J. Elazar, The American Partnership: Intergovernmental Co-operation in the Nineteenth-Century United States (Chicago: University of Chicago Press, 1962). 3. Steward Machine Co. v. Davis, 301 U.S. 548 (1937). 4. United States v. Darby Lumber Co., 312 U.S. 100 (1941). 5. Wickard v. Filburn, 317 U.S. 111 (1942). 6. New York v. United States, 505 U.S. 144 (1992). 7. Printz v. United States, 521 U.S. 898 (1997). 8. National Federation of Independent Business v. Sebelius, 567 U.S. 519 (2012). 9. Erwin Chemerinsky, Constitutional Law: Principles and Policies, 6th ed. (New York: Wolters Kluwer, 2019), 247-312. 10. Jessica Bulman-Pozen and Heather K. Gerken, “Uncooperative Federalism,” Yale Law Journal 118, no. 7 (2009): 1256-1310. (Offering a critical refinement from within the cooperative federalism tradition, arguing that state resistance within federal programs can itself serve federalism values.) 11. Samuel R. Bagenstos, “Spending Clause Litigation in the Roberts Court,” Duke Law Journal 58, no. 2 (2008): 345-420.