## Learning Outcomes

- Define **federalism** and **concurrent powers** in precise AP Government terms
- Distinguish concurrent powers from enumerated powers and reserved powers
- Explain why shared powers can limit or slow public policy
- Understand how the **Supremacy Clause** and **Tenth Amendment** shape federal-state conflict
- Apply required and supporting Supreme Court cases to federalism questions
- Analyse how grants, preemption, and anti-commandeering affect policy outcomes
- Use concrete examples from public policy areas such as education, transportation, health, and marijuana regulation

## AP United States Government and Politics Syllabus

For the AP United States Government and Politics, you are expected to understand how concurrent powers constrain policy, with a focus on the following syllabus points:

- Know that **concurrent powers** are powers shared by the national and state governments
- Identify common concurrent powers, including taxation, borrowing money, establishing courts, law enforcement, and spending for the general welfare
- Explain how the **Supremacy Clause** in Article VI gives valid federal law priority over conflicting state law
- Understand how the **Tenth Amendment** reserves undelegated powers to the states or the people
- Know how **McCulloch v. Maryland (1819)** strengthened federal supremacy in conflicts involving shared powers
- Explain how **United States v. Lopez (1995)** showed that federal power has limits
- Understand how conditional spending, preemption, and anti-commandeering shape federal-state relations
- Apply federalism concepts to policy areas such as public health, education, transportation, and drug policy

## Test Your Knowledge

_Attempt these questions before reading this article. If you find some difficult or cannot remember the answers, look more closely at that area during your revision._

1. What are concurrent powers, and how are they different from reserved powers?
2. Why does sharing power between the federal government and the states sometimes make policy harder to implement?
3. How does the Supremacy Clause affect conflicts between state law and federal law?
4. What did **McCulloch v. Maryland** say about a state using its taxing power against the federal government?
5. How can Congress influence state policy without directly ordering states to act?

## Introduction

Federalism is not just a diagram showing two levels of government. On the AP exam, it is a system of ongoing bargaining, conflict, and compromise between the national government and the states. The subtopic “concurrent powers constrain policy” is really about one big idea: when both levels of government can act in the same policy area, neither level can always get exactly what it wants.

That overlap creates limits. It can produce delay, legal disputes, uneven policy across states, and dependence on funding deals. It can also protect liberty by preventing one level of government from having total control. This makes concurrent powers a good example of the broader AP themes of constitutionalism and competing policy-making interests.

> **Key Term: federalism**
> The constitutional division of power between the national government and state governments.

### What concurrent powers are and why they matter

**Concurrent powers** are powers shared by both the federal and state governments. This is a basic definition, but students often stop there. For the exam, you need the next step: shared powers matter because they create overlapping authority.

Common examples include:

- levying and collecting taxes
- borrowing money
- establishing courts
- making and enforcing laws
- spending for the general welfare
- building roads
- chartering banks and corporations
- using **eminent domain**
  > **Key Term: concurrent powers**
  > Powers shared by both the national and state governments.

Concurrent powers are different from **enumerated powers**, which belong to the national government under the Constitution, and **reserved powers**, which belong mainly to the states under the Tenth Amendment.

For example:

- Congress can regulate interstate commerce and declare war: these are enumerated powers.
- States run elections, regulate intrastate business, and manage local governments: these are reserved powers.
- Both can tax and maintain court systems: these are concurrent powers.

This distinction matters because AP questions often try to confuse shared powers with reserved powers.

> **Key Term: reserved powers**
> Powers not delegated to the national government and not prohibited to the states, reserved to the states or the people.

Why do concurrent powers constrain policy? Because once authority is shared, policy is no longer simple. If both levels can tax, spend, regulate, and enforce laws, they must constantly adjust to each other. That means:

- the national government may want uniform policy
- states may want local flexibility
- courts may need to decide who has the stronger constitutional claim

A simple example is transportation. States build and maintain roads, but the federal government often helps fund them. That means state freedom is limited by federal conditions attached to the money.

> **Test Tip:** If a multiple-choice question asks which power is concurrent, choose something both levels do, such as taxation or establishing courts, not foreign policy or public education alone.

### How the Constitution creates both overlap and limits

Two constitutional rules are central here: the **Supremacy Clause** and the **Tenth Amendment**. These work together, not separately.

The Supremacy Clause in Article VI says that the Constitution and valid federal laws are the supreme law of the land. This means that when a state law directly conflicts with a valid federal law, the federal law prevails.

> **Key Term: Supremacy Clause**
> The constitutional rule in Article VI stating that the Constitution and valid federal laws override conflicting state laws.

The Tenth Amendment says powers not delegated to the United States and not denied to the states are reserved to the states or the people. This reminds us that the national government is limited and that states still retain important authority.

Students often miss the tension between these two principles. The Supremacy Clause does not erase the states. The Tenth Amendment does not let states ignore federal law. Instead, the Constitution creates a system in which:

- states have real authority
- the national government has limited but supreme authority when acting constitutionally
- courts resolve the boundary disputes

That is why concurrent powers constrain policy. Neither side has total control in most domestic policy areas.

Consider public health. States have broad police powers to protect health and safety. But when federal funding or national regulations are involved, state choices may narrow. During crises, states may act first, but federal agencies, federal money, and federal rules can all affect what states can actually do.

The same logic applies to education. States run schools, but federal grants and federal conditions shape standards, testing, and access. So a state may have formal control over schools, yet still face strong policy pressure from Washington.

### Concurrent powers in Supreme Court cases

The most important required case here is **McCulloch v. Maryland (1819)**. Maryland tried to tax the Second Bank of the United States. Taxation is a concurrent power, so on the surface Maryland seemed to be using one of its legitimate powers. But the Court said the state could not use that shared power to interfere with a valid federal institution.

Chief Justice John Marshall wrote that “the power to tax involves the power to destroy.” The Court held two major things:

- Congress had implied powers under the Necessary and Proper Clause to create the national bank
- Maryland could not tax the bank because federal law is supreme over conflicting state action

This case is essential because it shows that concurrent powers are real, but not equal in a direct conflict. A state may tax generally, but it may not use that power to undermine valid federal action.

> **Key Term: implied powers**
> Powers not listed directly in the Constitution but reasonably derived from enumerated powers, often through the Necessary and Proper Clause.

Another required case is **United States v. Lopez (1995)**. Congress had passed the Gun-Free School Zones Act, banning gun possession in school zones. The government argued this fit under the Commerce Clause. The Supreme Court disagreed, ruling that carrying a gun in a local school zone was not close enough to interstate commerce.

Lopez matters because it reminds students that federal power has judicially enforceable limits. Not every problem can be turned into a federal issue. In federalism terms, this strengthens state sovereignty in some policy areas.

Put together, these two required cases show both sides of federalism:

- **McCulloch** expands national power when Congress acts constitutionally
- **Lopez** limits national power when Congress goes too far

That balance is exactly what AP questions often test.

Now add important supporting cases.

**South Dakota v. Dole (1987)** showed how the federal government can influence state policy through spending. Congress said states would lose 5% of their federal highway funds if they did not raise the drinking age to **21**. The Court upheld this condition.

This case matters because it shows a common way concurrent powers constrain policy: the national government may not control every state decision directly, but it can push states by attaching conditions to grants.

> **Key Term: fiscal federalism**
> The use of federal funding, often through grants, to influence state and local policy.

But there are limits. In **NFIB v. Sebelius (2012)**, the Court ruled that Congress could not pressure states into Medicaid expansion by threatening existing Medicaid funds in a way that became coercive. The message was clear: encouragement is allowed, coercion is not.

Another major limit comes from **Printz v. United States (1997)**. The Court ruled that the federal government cannot commandeer state officials to carry out federal law. This is called the anti-commandeering principle. The national government can regulate directly, preempt state law, or offer money with conditions, but it cannot simply order state officers to do its work.

> **Key Term: anti-commandeering**
> The principle that the federal government cannot require state officials to enforce or administer a federal regulatory program.

Finally, **Gonzales v. Raich (2005)** showed that when state and federal policies conflict in an overlapping area, federal law may still control. California allowed medical marijuana, but the federal government still banned marijuana under national law. The Court upheld federal authority. So even where states try a different policy path, federal law can prevail.

> **Test Tip:** For FRQs, use a case with a clear mechanism. For example: McCulloch for supremacy, Dole for conditional spending, Printz for anti-commandeering, Lopez for limits on federal power.

### How concurrent powers constrain policy in practice

The easiest mistake is to describe concurrent powers as cooperation only. Cooperation matters, but the exam wants you to explain constraint.

There are several main mechanisms.

First, **conflict**. When federal and state governments want different outcomes, policy may end up in court. Marijuana policy is a good example. Some states permit medical or recreational marijuana, yet federal law still prohibits it. This creates uncertainty for users, businesses, banks, and law enforcement.

Second, **duplication**. Both levels may operate courts, tax systems, and enforcement systems. That can produce inefficiency or confusion. A business may face federal rules and state rules at the same time.

Third, **delay**. Shared authority often means negotiation. Congress may pass a law, but states may need time, resources, or regulations to put it into effect. If states resist, implementation slows.

Fourth, **uneven implementation**. Federal policy may depend on state administration. This means one national policy can look different across the country. In education, health care, and transportation, states often carry out the program, so outcomes vary.

Fifth, **funding dependence**. States may have formal authority but lack financial independence. Federal grants shape what states can realistically do. A state may legally choose one path, but practically choose another because it needs federal money.

Sixth, **constitutional limits on enforcement**. Even if Congress wants a uniform result, it may not commandeer states. So implementation may depend on state cooperation, direct federal enforcement, or court rulings.

A useful AP formula is:

- shared authority
- plus constitutional limits
- plus money
- equals constrained policy

Consider these issue areas:

- **Transportation:** states manage roads, but highway funds can come with national conditions
- **Public health:** states regulate health and safety, but federal funds and federal program rules matter
- **Education:** states run schools, but federal grants can push national priorities
- **Criminal law:** states usually enforce local crimes, but federal law may overlap in drugs, guns, or civil rights enforcement

This is why federalism in action is rarely neat. Shared powers do not produce one clean national outcome. They produce bargaining.

## Key Point Checklist

_This article has covered the following key knowledge points:_

- Federalism is the constitutional division of power between the national and state governments
- Concurrent powers are shared by both levels of government
- Common concurrent powers include taxation, borrowing money, establishing courts, and spending for the general welfare
- Concurrent powers constrain policy because overlapping authority creates conflict, delay, duplication, and uneven implementation
- The Supremacy Clause means valid federal law overrides conflicting state law
- The Tenth Amendment reserves undelegated powers to the states or the people
- McCulloch v. Maryland (1819) showed that states cannot use a concurrent power to obstruct valid federal action
- United States v. Lopez (1995) showed that federal power has limits and some issues remain more strongly tied to the states
- South Dakota v. Dole (1987) showed that Congress can use conditional grants to influence state policy
- NFIB v. Sebelius (2012) showed that conditional spending cannot become coercive
- Printz v. United States (1997) showed that the federal government cannot commandeer state officials
- Gonzales v. Raich (2005) showed that federal law may prevail even when states adopt different policies in overlapping areas

## Key Terms and Concepts

- federalism
- concurrent powers
- reserved powers
- Supremacy Clause
- implied powers
- fiscal federalism
- anti-commandeering


Federalism in Action - Concurrent powers constrain policy