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Reading Time: 8 min
Last Updated: August 26, 2026
Main Ideas: 5
Reading Time: 8 min
Last Updated: August 26, 2026
Main Ideas: 5

Topic 1.9 Notes – Federalism in Action

Verified for 2027 AP® U.S. Government & Politics Exam
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Federalism in action is about what happens when power is split between the national government and the states. That split changes who can make policy, where groups try to influence it, why laws differ across states, and why the national government often has to persuade states instead of simply ordering them.

How Federalism Shapes Policymaking

Federalism means power is divided and shared. In practice, that affects policy every day because authority over an issue is often split instead of sitting entirely at one level.

  • Enumerated powers are powers the Constitution lists for the national government, like taxing, borrowing, and regulating interstate commerce.
  • Implied powers come from the Necessary and Proper Clause. Congress can use them to carry out its enumerated powers.
  • Reserved powers belong to the states under the Tenth Amendment.
  • Concurrent powers are shared by both levels, like taxing, spending, and making laws.

This division is easiest to picture as overlapping authority. Some powers belong primarily to the national government, some to the states, and some are shared.

Study guide illustration

Federalism and concurrent powers

The key idea here is that policy authority is often mixed. States have broad police powers, which means they regulate health, safety, welfare, and morals. That covers areas like education, criminal law, and election administration. The national government still shapes those areas through the Commerce Clause, federal spending, civil rights enforcement, and the Supremacy Clause.

So federalism does two things at once. It creates more chances for action, and it limits any one government from acting alone.

Multiple Access Points for Stakeholders

Because authority is divided, people and groups get multiple access points for influencing policy. If one door closes, another may still be open.

Stakeholders can try to influence:

  • National institutions such as Congress, the president, federal agencies, and federal courts
  • State institutions such as legislatures, governors, state agencies, and state courts
  • Local institutions such as city councils, county officials, and school boards
  • Voters directly through initiatives and referenda in some states

This is where venue shopping comes in. A group chooses the level or institution most likely to agree with it. If it loses in Congress, it might try state legislatures. If state officials dislike a federal policy, they might lobby Congress or sue in court.

A great example is marijuana legalization. Colorado and Washington legalized recreational marijuana at the state level even though federal law still banned it. That shows how groups can win policy change in one venue even when another venue is hostile.

Advantages:

  • more participation
  • more routes to policy change
  • easier to test ideas in friendly states

Disadvantages:

  • fragmented authority
  • conflicting goals across governments
  • uneven policy across the country

State Policy Variation and Cooperative Federalism

States can make different choices because of reserved and concurrent powers. That is why policy varies in education, criminal law, environmental rules, elections, and health policy.

People call states laboratories of democracy because they can test policies on a smaller scale. When other states copy or adapt those policies, that is policy diffusion.

Marijuana legalization is a good example again. It shows experimentation, but it also shows conflict because state permission did not erase federal prohibition.

Some issues work through cooperative federalism, where national and state governments share responsibility. Medicaid is the classic example.

  • Created in 1965
  • Joint federal-state health program
  • Federal government provides major funding and broad rules
  • States run their own programs within those rules

That produces shared authority, bargaining, and different outcomes by state.

Fiscal Federalism and National Influence on State Policy

Fiscal federalism means using money to shape federal-state relations. The national government usually has more money, so it often influences states through grants.

Grant typeWhat it means
Categorical grantsNarrow purpose, detailed rules
Block grantsBroad purpose, more state choice
Revenue sharingFew restrictions, greatest flexibility

The National Minimum Drinking Age Act of 1984 shows how this works:

  1. States normally control alcohol rules through police powers.
  2. Congress used its spending power instead of directly ordering states.
  3. States that kept the drinking age below 21 risked losing federal highway funds.
  4. Every state eventually adopted 21.

In South Dakota v. Dole (1987), the Court upheld this kind of conditional spending if the condition is clear, related to the program, and not too coercive.

A mandate requires states or local governments to do something. Unfunded mandates make them pay much of the cost themselves. The Americans with Disabilities Act of 1990 is a common example because compliance can require expensive changes by state and local governments.

Why National Policymaking Is Constrained

The national government cannot act wherever it wants. Congress must point to a constitutional power. It has no general police power like the states do.

That basic division of power helps explain why states still control many issues tied to health, safety, welfare, and local commerce, even though their laws cannot conflict with federal law.

Study guide illustration

State police powers and federal supremacy

National policy often depends on:

  • valid enumerated or implied powers
  • state cooperation and implementation
  • negotiation and compromise
  • possible court review

States can resist by lobbying, seeking waivers, declining optional funding, or suing.

United States v. Lopez (1995) is the key limit case. The Court said the Gun-Free School Zones Act went beyond Congress’s Commerce Clause power. That did not mean guns near schools could not be regulated. It meant states could regulate that issue under their reserved powers.

Key Takeaways

Federalism gives stakeholders more places to fight for policy, which is why “multiple access points” is one of the most tested ideas in this topic.
States have broad police powers, and Congress does not, so the national government often uses spending, commerce, or civil rights enforcement to shape state policy.
Venue shopping means losing in one institution does not end the fight because groups can shift to another level of government.
Marijuana legalization works as both an access-point example and a policy-conflict example.
Medicaid is the standard cooperative federalism example because funding is national but administration is heavily state-based.
Conditional spending is influence, not a direct command, and South Dakota v. Dole explains when that pressure is constitutional.
Lopez limits national power under the Commerce Clause but still leaves room for states to regulate the same issue.
The Supremacy Clause only makes valid federal law supreme.

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