The Difference Between Federal and State Powers Explained

State Sovereignty and the Anti-Commandeering Doctrine

One of the most consequential doctrines protecting state authority from federal encroachment is the anti-commandeering principle, which holds that Congress may not directly compel state governments or their officials to implement or enforce federal law. The Supreme Court articulated this principle in New York v. United States (1992), where it struck down a federal law that required states to “take title” to radioactive waste or enact specified legislation. The Court held that the federal government may not simply conscript the machinery of state government to administer federal programs.

The doctrine was reinforced and extended in Printz v. United States (1997), in which the Court struck down a provision of the Brady Handgun Violence Prevention Act that temporarily required local law enforcement officials to conduct background checks on firearm purchasers. Justice Antonin Scalia’s majority opinion held that the Constitution does not permit Congress to commandeer state executive officers to enforce federal regulatory programs. More recently, Murphy v. National Collegiate Athletic Association (2018) extended the anti-commandeering principle to federal statutes that prohibit states from enacting certain laws — in that case, a federal statute that prevented states from authorizing sports gambling.

The practical effect of these decisions is significant. It means that while federal law may regulate private conduct directly, it cannot automatically draft state officials into service as federal enforcers. States retain a structural independence that allows them to decline to enforce federal priorities — a principle that underlies, for instance, the so-called “sanctuary” policies adopted by some states and municipalities that decline to cooperate with federal immigration enforcement in certain respects, as well as state-level marijuana legalization statutes that exist alongside federal prohibition.

Practical Impacts

How the Federal-State Power Division Affects Everyday Governance and Policy

The constitutional division of power between the federal government and the states produces visible, tangible consequences in how Americans are governed. Criminal law offers a clear example. The overwhelming majority of criminal prosecutions in the United States occur in state courts under state law, since general criminal authority — punishing murder, robbery, assault, fraud, and drug offenses not implicating federal regulatory schemes — falls within state police powers. Federal criminal law targets a narrower set of offenses: crimes that cross state lines, crimes against federal personnel or property, drug trafficking at a scale with interstate or international dimensions, and crimes involving federal programs.

Education presents another clear illustration of the division. The federal government does not establish a national curriculum or directly operate public schools. Those responsibilities rest with state governments and, through delegation, local school districts. However, the federal government influences education through conditional spending — most notably through Title I funding under the Elementary and Secondary Education Act and through the Individuals with Disabilities Education Act, which provide federal dollars to states and local districts in exchange for compliance with specific requirements.

Healthcare regulation is divided along similarly complex lines. The regulation of health insurance markets, medical device safety, and pharmaceutical approval falls primarily within federal authority. The operation of hospitals, the licensing of physicians and nurses, and the administration of Medicaid programs are matters of state law — though Medicaid is jointly funded by federal and state governments and is governed by a complex web of federal conditions. Environmental law adds yet another layer of complexity: the Environmental Protection Agency sets national air and water quality standards under federal statute, but states often have primary enforcement responsibility, and states may in some cases adopt standards stricter than federal minimums.

Common Questions

Frequently Asked Questions About Federal and State Powers

What does the Tenth Amendment actually guarantee to states?

The Tenth Amendment provides that any powers not specifically granted to the federal government by the Constitution, and not prohibited to the states, are retained by the states or by the people. In practical terms, this means states retain broad authority over areas such as criminal law, family law, public education, and local commerce. However, courts have consistently held that the Tenth Amendment does not prevent Congress from regulating private conduct in areas with a substantial effect on interstate commerce, even if states would prefer to handle the matter themselves.

Can a state law override a federal law?

No. Under the Supremacy Clause in Article VI of the Constitution, valid federal law is the supreme law of the land and prevails over conflicting state laws. When Congress enacts a law within its constitutional authority that directly conflicts with a state statute, federal preemption doctrine holds that the state law is without effect to the extent of the conflict. However, federal law does not preempt state law in every case — courts must determine whether Congress intended preemption and whether a genuine conflict exists.

Why can states legalize marijuana even though it remains illegal under federal law?

The anti-commandeering doctrine, established through cases such as Printz v. United States (1997), prohibits the federal government from compelling state officials to enforce federal law. A state may therefore choose not to criminalize marijuana possession or distribution under its own law, and state officials are not obligated to enforce the federal Controlled Substances Act on Congress’s behalf. Federal authorities retain the legal authority to enforce federal drug law within state borders, but the practical result is that states with permissive marijuana laws face limited federal intervention when federal enforcement priorities lie elsewhere.

What are concurrent powers in the U.S. system?

Concurrent powers are authorities that both the federal government and state governments may exercise simultaneously. Both levels of government, for example, may levy and collect taxes, borrow money, charter banks, establish courts, and build roads. When both governments exercise concurrent authority over the same subject matter and their laws conflict, the Supremacy Clause determines that the valid federal law prevails. In areas of concurrent jurisdiction where there is no direct conflict, both sets of laws remain in effect.

How does the federal government get states to follow national policy if it cannot directly command them?

Congress frequently uses conditional federal spending — also known as “cooperative federalism” — to encourage states to adopt federal policy priorities. Under this approach, the federal government offers states financial grants attached to conditions requiring compliance with federal standards. States that decline the conditions forgo the funding but are otherwise free to govern their own programs. The Supreme Court has held, however, that conditions must be related to the federal interest being advanced and may not be so coercive as to leave states no genuine choice.

Sources Referenced

U.S. Constitution, Article I, Section 8; Article VI, Clause 2; and the Tenth Amendment (1791) — National Archives
McCulloch v. Maryland, 17 U.S. 316 (1819) — U.S. Supreme Court
Gibbons v. Ogden, 22 U.S. 1 (1824) — U.S. Supreme Court
Wickard v. Filburn, 317 U.S. 111 (1942) — U.S. Supreme Court
South Dakota v. Dole, 483 U.S. 203 (1987) — U.S. Supreme Court
New York v. United States, 505 U.S. 144 (1992) — U.S. Supreme Court
United States v. Lopez, 514 U.S. 549 (1995) — U.S. Supreme Court
Printz v. United States, 521 U.S. 898 (1997) — U.S. Supreme Court
NFIB v. Sebelius, 567 U.S. 519 (2012) — U.S. Supreme Court
Murphy v. National Collegiate Athletic Association, 584 U.S. 453 (2018) — U.S. Supreme Court
Cornell Law School Legal Information Institute — Constitutional Law: Federalism Overview
Congressional Research Service — Federal-State Relationships in the U.S. System of Government

The Enduring Framework

A Living Division: Why Federalism Still Defines American Governance

The difference between federal and state powers is neither a settled boundary drawn once in 1787 nor a relic of purely academic interest. It is an active, contested, and consequential feature of American constitutional life that shapes the reach of criminal law, the structure of healthcare and education policy, the enforcement of environmental protections, and the limits of executive authority at every level of government. The framers deliberately chose ambiguity in places, recognizing that a rigid allocation of power would fail to accommodate the demands of a nation they could not fully anticipate. The result is a federal system that has proven both durable and contentious — one in which the Supreme Court, Congress, the states, and the American people continuously negotiate who governs what, in which territory, and to what end. For citizens navigating that system, understanding how the Constitution divides authority is not merely useful background knowledge; it is a practical necessity for understanding whose decisions actually bind them and whose policies they have the power to change through their vote.