Lesson 05: Federalism

Starter

In 2012, the Supreme Court heard a case about whether the federal government could require nearly every American to buy health insurance. Most people thought the fight would be about the Commerce Clause. It was — but that's not how the law survived. The Court said Congress could not use its power to regulate interstate commerce to force people to buy a product. The law lived only because the penalty was reclassified as a tax.

Tucked inside that ruling was a second question almost nobody noticed: Could Congress threaten to cut off all of a state's existing Medicaid money if the state refused to expand the program? The Court said no — that wasn't an offer, it was "a gun to the head."

Notice what's happening. Two governments, one population, one territory. Who decides? When can Washington tell Sacramento or Austin what to do — and when can't it? That single question is federalism, and it has been the longest-running argument in American politics. Today you learn the clauses, the cases, and the money that settle it.

Core Concepts

Federalism is the constitutional division of power between a national (central) government and regional (state) governments, where each level has its own authority that the other cannot simply erase. It sits between two alternatives the Founders rejected: a unitary system (all power flows from the center, like the United Kingdom) and a confederal system (the states hold the real power and the center is weak, like the failed Articles of Confederation). The Constitution split the difference on purpose.

The catch is that the Constitution never uses the word "federalism," and it never hands you a clean list of who does what. Instead, the boundary is drawn by a handful of clauses — and most political conflict over federal power is really a fight about what those clauses mean.

The four boundary-drawing clauses

The Supremacy Clause (Article VI, Clause 2) declares that the Constitution, federal laws, and treaties are "the supreme Law of the Land," and that state judges are bound by them "any Thing in the Constitution or Laws of any State to the Contrary notwithstanding." Translation: when valid federal law and state law collide, federal law wins. This is the tiebreaker that makes the whole system hold together.

The Necessary and Proper Clause (Article I, Section 8, Clause 18) — also called the Elastic Clause — gives Congress power "To make all Laws which shall be necessary and proper for carrying into Execution" its other listed powers. This clause is the source of implied powers: powers not written down but reasonably needed to carry out the powers that are written down. It stretches federal authority, which is why it's nicknamed "elastic."

The Commerce Clause (Article I, Section 8, Clause 3) lets Congress "regulate Commerce with foreign Nations, and among the several States." Three words — "among the several States" — became one of the most powerful tools in American government. For most of the 20th century, courts read it broadly enough to justify federal laws on civil rights, labor, the environment, and much more. The logic: almost any economic activity, repeated nationwide, affects interstate commerce.

The Tenth Amendment is the counterweight: "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." These are the reserved powers — everything left to the states, such as running schools, issuing marriage and drivers' licenses, setting up local police, and conducting elections.

Two more provisions matter. The Fourteenth Amendment (1868) restricts the states: no state may "deprive any person of life, liberty, or property, without due process of law" or deny "the equal protection of the laws." It flipped part of the federal relationship — now the national government could police state governments to protect individual rights. And the Full Faith and Credit Clause (Article IV, Section 1) requires each state to respect "the public Acts, Records, and judicial Proceedings of every other State" — which is why a marriage or court judgment in one state is honored in another.

The four types of powers

• Enumerated (expressed) powers — explicitly listed for the national government, mostly in Article I, Section 8: coin money, declare war, raise an army, regulate interstate commerce.
• Implied powers — not listed but justified through the Necessary and Proper Clause (e.g., creating a national bank, an air force, a minimum wage).
• Reserved powers — kept by the states under the Tenth Amendment (education, intrastate commerce, public health and safety).
• Concurrent powers — shared by both levels: the power to tax, build roads, borrow money, establish courts, and make and enforce laws.

In Practice. When you got your driver's license, the state set the rules — a reserved power. But the drinking age printed on it is 21 in every state because of the federal government. Congress can't directly set a drinking age (not an enumerated power), so in 1984 it passed a law withholding 10% of federal highway funds from any state that allowed drinking under 21. Every state "voluntarily" complied. That's fiscal federalism in one sentence: Washington can't always command, but it can pay — or threaten not to.

From dual to cooperative federalism

Early American federalism is often pictured as a layer cake — distinct, separate layers. This is dual federalism: national and state governments operate in their own clearly divided spheres, each supreme in its own zone. This model dominated roughly from the founding to the 1930s.

The Great Depression and the New Deal shattered it. The modern model is cooperative federalism, pictured as a marble cake: the levels are swirled together, sharing functions, funding, and administration. Today a single highway, school, or disaster response usually involves federal money, state management, and local execution all at once.

Fiscal federalism: how money shapes policy

Fiscal federalism is the use of federal taxing and spending to influence state and local governments. The main tools are grants-in-aid — transfers of federal money to the states — in two flavors:

• Categorical grants come with strings. The money must be spent on a specific, narrowly defined purpose (e.g., school lunches, a particular highway), and states must meet federal conditions. They give Washington maximum control.
• Block grants are broad. The money goes toward a general area (e.g., community development or welfare) and states get wide discretion on how to spend it. They give states more flexibility.

Federal money also comes with mandates — rules a state must follow. When Congress requires action but provides no money to pay for it, that's an unfunded mandate (a frequent state complaint; the Unfunded Mandates Reform Act of 1995 tried to limit them). The push to return power and responsibility from the federal government back to the states — through block grants and deregulation — is called devolution, a major theme of the 1980s–1990s.

The whole system runs on a tension: the national government wants uniform national standards; states want flexibility and resist Washington's reach. The clauses and the cases below are how that tension gets resolved.

Document Spotlight: The Constitution's Federalism Provisions

The Constitution doesn't define federalism — it enacts it through a few short passages. On the AP exam, you're expected to quote or paraphrase these accurately and explain how they function.

Supremacy Clause — Article VI, Clause 2 (authentic wording):

"This Constitution, and the Laws of the United States which shall be made in Pursuance thereof... shall be the supreme Law of the Land."

What it means: Valid federal law overrides conflicting state law. On the exam: cite it whenever a state tries to block, tax, or override a federal action.

Necessary and Proper (Elastic) Clause — Article I, Section 8, Clause 18:

"To make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers..."

What it means: Congress may use unlisted means to carry out its listed powers — the source of implied powers. On the exam: the go-to clause for expanding federal power.

Commerce Clause — Article I, Section 8, Clause 3:

"To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes."

What it means: Congress can regulate economic activity that crosses or affects state lines. On the exam: the basis for huge swaths of federal law — and the clause at issue when the Court limits federal reach.

Tenth Amendment:

"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."

What it means: Whatever isn't given to the national government (and isn't forbidden to the states) belongs to the states. On the exam: the clause states invoke to resist federal overreach.

A reliable exam pattern: the Necessary and Proper and Commerce clauses pull power toward Washington; the Tenth Amendment pulls it back to the states; the Supremacy Clause decides who wins a direct conflict.

SCOTUS Case Breakdown

Case 1 — McCulloch v. Maryland (1819)

Facts of the case. In 1816 Congress chartered the Second Bank of the United States and opened a branch in Baltimore. Maryland, hostile to the national bank, passed a law taxing any bank not chartered by the state — aimed squarely at the federal branch. James McCulloch, the branch's cashier, refused to pay the tax, and Maryland sued.

Constitutional question. Does Congress have the constitutional power to charter a national bank, and may a state tax an institution created by the federal government?

Holding. Yes and no: Congress does have the implied power to create a bank under the Necessary and Proper Clause, and Maryland may not tax it, because the Supremacy Clause bars a state from interfering with a legitimate federal institution.

Reasoning. Chief Justice John Marshall, for a unanimous Court, reasoned that although chartering a bank is not an enumerated power, the Necessary and Proper Clause lets Congress choose appropriate means to carry out its enumerated powers (taxing, borrowing, regulating commerce): "Let the end be legitimate... and all means which are appropriate, which are plainly adapted to that end... are constitutional." On the tax, Marshall invoked the Supremacy Clause, famously warning that "the power to tax involves the power to destroy" — allowing a state to tax a federal institution would let one state cripple the entire nation's government.

Impact. McCulloch is the foundational case for implied powers and broad national authority. It established that federal power can grow beyond the literal text of Article I, Section 8, and that states cannot obstruct valid federal action. It is the case to cite whenever the question is about expanding federal power — the mirror image of Lopez.

Case 2 — United States v. Lopez (1995)

Facts of the case. In 1992 Alfonso Lopez, Jr., a 12th-grade student in San Antonio, Texas, brought a concealed handgun into his high school. He was charged under the federal Gun-Free School Zones Act of 1990, which made it a federal crime to possess a firearm within 1,000 feet of a school. Lopez argued Congress had no constitutional authority to pass such a law.

Constitutional question. Did Congress exceed its authority under the Commerce Clause when it made gun possession in a local school zone a federal crime?

Holding. Yes — the Gun-Free School Zones Act exceeded Congress's Commerce Clause power, because possessing a gun near a school is not an economic activity that substantially affects interstate commerce.

Reasoning. Chief Justice William Rehnquist, for a 5–4 majority, held that the Commerce Clause reaches economic activity that substantially affects interstate commerce — but carrying a gun in a school zone is "in no sense an economic activity." The Court warned that accepting the government's reasoning would leave almost no activity beyond federal control, erasing the distinction "between what is truly national and what is truly local." Regulating guns in schools was a matter for the states under their reserved (Tenth Amendment) police powers.

Impact. Lopez was the first case since the New Deal era (since 1937) to strike down a federal law for exceeding the commerce power. It signaled that the Commerce Clause is not unlimited and reaffirmed a meaningful boundary protecting state authority. It is the case to cite whenever the question is about limiting federal power — the counterweight to McCulloch.

Application Practice

Work each scenario the AP way: identify the constitutional issue → state the relevant clause/principle → apply it → predict the outcome.

Scenario 1 — The conditional grant. Congress wants every state to adopt a uniform standard for high-school graduation but knows education is a reserved power. So it passes a law offering states a large new categorical grant for school technology — available only to states that adopt the standard. A governor calls it federal blackmail. Analysis: The issue is fiscal federalism and the spending power. Education is reserved to the states under the Tenth Amendment, so Congress cannot command the standard directly. But Congress may attach conditions to grants-in-aid; states remain free to refuse the money. Predicted outcome: The condition is generally constitutional, as long as it is related to the funded program and is not so coercive that it becomes "a gun to the head." Most states will comply to get the money — federalism by checkbook.

Scenario 2 — Reaching into local activity. Congress passes a law banning the possession of a certain homemade item in private homes, claiming Commerce Clause authority because the materials might someday be sold across state lines. Analysis: The issue is the limit of the Commerce Clause. Under Lopez, Congress may regulate activity that substantially affects interstate commerce, but purely local, non-economic possession falls outside that reach. Predicted outcome: If the activity is non-economic and the interstate connection is speculative, a court following Lopez would likely strike the law as exceeding the commerce power — a Tenth Amendment matter for the states.

Scenario 3 — State tax on a federal operation. A state imposes a special tax on a federal research facility operating within its borders, arguing it's just a normal business tax. Analysis: The issue is supremacy. Under McCulloch v. Maryland, a state may not tax a legitimate federal instrumentality, because "the power to tax involves the power to destroy" and the Supremacy Clause forbids state interference with federal operations. Predicted outcome: The tax is unconstitutional.

Traps & Confusions

Federalism vs. separation of powers. These are different axes. Federalism divides power vertically — between national and state governments. Separation of powers divides power horizontally — among the legislative, executive, and judicial branches at the same level. A fight between Congress and the President is separation of powers; a fight between Congress and Texas is federalism. Don't mix them up on an FRQ.

Categorical vs. block grants. Categorical = narrow purpose, many strings, more federal control. Block = broad purpose, few strings, more state flexibility. Memory hook: categorical is for a specific goal; block covers a broad block of activity.

McCulloch vs. Lopez. Both are federal-power cases, but they point in opposite directions. McCulloch expands national power (Necessary and Proper Clause → implied powers; Supremacy Clause). Lopez limits national power (Commerce Clause has boundaries; some matters are reserved to the states). If the prompt is about Washington reaching further, think McCulloch; if it's about a limit, think Lopez.

Enumerated vs. reserved vs. concurrent. Enumerated = listed for the nation (Art. I, §8). Reserved = left to the states (10th Amendment). Concurrent = shared by both (taxing, borrowing, courts). Students lose points by calling a shared power like taxation an "enumerated federal power only" — both levels tax.

Practice Problems

FRQ Practice — SCOTUS Comparison (FRQ 3)

Non-required case (provided). In Gonzales v. Raich (2005), California legalized marijuana grown and used at home for medical purposes under state law. Federal agents, enforcing the national Controlled Substances Act, destroyed the home-grown plants of two California patients. The patients sued, arguing that marijuana they grew and consumed entirely within one state — never bought, sold, or moved across state lines — was a purely local activity beyond Congress's reach. The Supreme Court disagreed, holding that Congress could regulate even purely local, home-grown marijuana, because such local activity, taken in the aggregate, substantially affects the national interstate market that Congress is entitled to regulate under the Commerce Clause.

Prompt. Based on the information above, respond to the following.

(A) Identify the constitutional clause that is common to both Gonzales v. Raich (2005) and United States v. Lopez (1995).

(B) Explain how the facts of Gonzales v. Raich led to a different holding than the holding in United States v. Lopez.

(C) Describe an action that Congress could take if it disagreed with how the Court has interpreted the scope of federal power in commerce cases.

Model Response

(A) — 1 point. Both cases were decided under the Commerce Clause (Article I, Section 8, Clause 3), which gives Congress the power to regulate commerce "among the several States."

(B) — 1 point. In Lopez, the Court held that possessing a gun in a school zone was not an economic activity and therefore did not substantially affect interstate commerce, so the federal law exceeded the Commerce Clause. In Raich, by contrast, the activity — growing and consuming marijuana — was economic, and the Court reasoned that home-grown marijuana, taken in the aggregate, substantially affects the national drug market Congress already regulates. Because the activity in Raich was economic and tied to a larger regulatory scheme (while the activity in Lopez was not), the Court upheld federal power in Raich but struck it down in Lopez.

(C) — 1 point. Congress could rewrite the statute to add an explicit interstate-commerce connection (a "jurisdictional hook") — for example, requiring proof that the regulated item moved in or affected interstate commerce. (Other acceptable answers: hold hearings to build a record of commercial effects; pass the law using a different enumerated power, such as the taxing or spending power; or propose a constitutional amendment.)

Total: 3 points.

Common point-loss: - Part A: naming the wrong clause (students often write "Necessary and Proper" or "Supremacy") — the shared clause here is the Commerce Clause. No credit for a vague answer like "Article I" without identifying commerce. - Part B: merely describing both holdings without explaining the difference in the facts (economic vs. non-economic activity, and the aggregation reasoning). The exam rewards the constitutional mechanism, not a retelling of events. - Part C: describing what the Court could do (it can't change its own holding by statute) instead of an action Congress could take. The question asks about the legislative branch's response.