Reserved Powers: Understanding State Authority Under the U.S. Constitution
The federal government does not have these powers, and the states are not told they cannot have them. The states use these reserved powers to make decisions about things that affect people’s lives. The United States Constitution grants the states the authority to govern matters that are close to the people who reside within them.
This is a part of what American federalism is all about. The states get to make decisions about matters that’re important to the people who live in the states.
In Depth
What are Reserved Powers?
Reserved powers are the powers that belong to the states — not the federal government. They are called “reserved” because they were specifically held back, or reserved, for state governments when the Constitution was written.
Here’s the simplest way to think about it: The Constitution gives Congress a list of things it is allowed to do — declare war, coin money, regulate trade between states, and so on. These are called enumerated or expressed powers. But the Constitution does not — and cannot — list every single thing a government might ever need to handle. So what happens with everything not on that federal list?
Those powers go to the states.
This isn’t an accident or a loophole. It was a deliberate choice. The Founders had just broken away from a centralized British monarchy that ruled everything from the top. The last thing they wanted was to recreate that same dynamic in their new country. So they built in a safeguard: a clear constitutional rule that says states keep the powers the federal government doesn’t specifically claim.
That rule lives in the Tenth Amendment — and it’s the foundation of everything we’re going to cover on this page.
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The Tenth Amendment: The Constitutional Home of Reserved Powers
The Tenth Amendment to the United States Constitution reads:
“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.”
It’s one sentence. Forty-five words. And it carries enormous weight in American constitutional law.
What Does “Delegated” Mean Here?
When the Tenth Amendment says “powers not delegated to the United States,” it’s referring to the enumerated powers — the things the Constitution specifically hands to the federal government. Powers like levying taxes, regulating interstate commerce, running the postal service, and maintaining the military.
Anything outside that list — education, family law, public health regulations, most criminal law, licensing for drivers and doctors — falls under state authority. That’s reserved powers in action.
You can learn about state criminal law jurisdiction here
Why Was the Tenth Amendment Added?
The original Constitution, drafted in 1787, did not include a Bill of Rights at all. Several states refused to ratify it because of this. They feared that without an explicit protection of state power, the new federal government would gradually absorb everything and leave states with nothing meaningful to govern.
The Tenth Amendment was the compromise. It was a written promise: the federal government gets what the Constitution gives it, and nothing more. States keep the rest.
For Anti-Federalists like Patrick Henry and George Mason — who had fought hard against what they saw as a dangerously powerful central government — the Tenth Amendment was one of the most important additions to the entire Bill of Rights.
Reserved Powers vs. Expressed Powers vs. Concurrent Powers: What's the Difference?
One of the most common points of confusion — especially for AP Government students — is understanding how reserved powers fit into the larger picture of constitutional power. Here’s a clean breakdown:
Reserved Powers
Everything else. If the Constitution didn’t give a power to the federal government, and didn’t take it away from the states, it belongs to the states. Education, marriages and divorces, driver’s licenses, business regulations within a state, public health codes — all of this falls here.
Expressed Powers
These are the powers the Constitution explicitly gives to the federal government. Congress can declare war. Congress can borrow the money. Congress can also regulate the commerce between states. These are spelled out directly in Article I, Section 8.
Concurrent Powers
Some powers belong to both the federal government and the states at the same time. Collecting taxes is a good example. Both the IRS and your state’s revenue department can tax you. Both Congress and state legislatures can pass criminal laws. These shared powers are concurrent powers.
Implied Powers
These are the powers not explicitly written in the Constitution but derived from the Necessary and Proper Clause — also called the Elastic Clause. They allow Congress to do what is needed to carry out its listed powers. The Air Force, the FBI, and the Federal Reserve all exist because of implied powers.
Reserved Powers Examples: Where You See Them in Real Life
Reserved powers aren’t an abstract theory. They show up in laws and systems you interact with constantly. Here are the clearest real-world examples:
Public Education
There is no federal Department of Education that sets your school’s curriculum. That’s because education is a reserved power. State governments — and often local school boards — decide what students learn, what standards teachers must meet, how schools are funded, and when the school year starts and ends.
Similarly, states govern construction contractor disputes, as seen in the Texas Built Construction Lawsuit.
Speed Limits and Traffic Laws
You might have noticed that speed limits vary from state to state on highways. Montana once famously had no daytime speed limit at all. That’s because traffic law is a reserved power.
The federal government can tie funding to speed limit standards (and has in the past), but the actual laws are state laws.
Driver's Licenses and Professional Licensing
Your driver’s license is issued by your state, not the federal government. The same goes for licenses to practice medicine, law, nursing, plumbing, or real estate. States set their own requirements, their own testing standards, and their own renewal processes.
A medical license from New York doesn’t automatically work in Texas — because each state controls its own licensing under reserved powers.
Marriage and Family Law
Who can get married, how divorces are handled, and how child custody is decided are all state matters.
Before the Supreme Court’s 2015 ruling in Obergefell v. Hodges, marriage law varied dramatically from state to state precisely because it fell under reserved powers.
Even today, divorce laws, alimony rules, and adoption procedures differ significantly across state lines.
Reserved Powers and American Federalism: The Bigger Picture
Understanding reserved powers means understanding federalism — the system that defines the relationship between the national government and the states.
America isn’t a unitary government where one central authority controls everything. And it isn’t a confederation where states are essentially independent countries. It’s a federal system — a careful balance between national unity and local self-governance.
Reserved powers are what make that balance real. Without them, every state would just be an administrative branch of the federal government. With them, states become meaningful governing units — capable of experimenting with different policies, responding to the specific needs of their residents, and serving as what Supreme Court Justice Louis Brandeis famously called “laboratories of democracy.”
When Massachusetts experimented with a universal healthcare law in 2006, it wasn’t overstepping — it was exercising reserved powers. When Colorado legalized recreational marijuana before federal law changed, it was doing the same. When states set their own minimum wages above the federal floor, that too is reserved powers in action.
When Reserved Powers and Federal Law Clash
This balance isn’t always smooth. The tension between state reserved powers and federal authority has been at the centre of some of the biggest debates in American history, from states’ rights arguments before the Civil War, to civil rights battles in the 1960s, to modern debates about immigration enforcement and marijuana legalisation.
The Supremacy Clause of the Constitution says that federal law is the “supreme law of the land meaning that when state and federal laws directly conflict, federal law wins. But this doesn’t erase reserved powers. It just means the federal government can’t be blocked by state law in areas where the Constitution gives it authority.
The ongoing negotiation between these two levels of government, over what belongs to the states, what belongs to Washington — is one of the defining tensions of American democracy. It doesn’t end. It evolves.
How the Supreme Court Has Interpreted Reserved Powers
The Tenth Amendment has had a complicated history in the courts. For most of the 20th century, it was treated as little more than a statement of obvious principle — what some justices called a “truism.” But starting in the 1970s, the Supreme Court began to take it more seriously as a meaningful limit on federal power
Key Cases to Know
National League of Cities v. Usery (1976): The Court struck down a federal law applying minimum wage rules to state employees, holding that the Tenth Amendment protected core state governmental functions. This decision was later overruled, but it signaled a shift in thinking.
New York v. United States (1992): The Court ruled that the federal government cannot “commandeer” state legislatures — meaning it cannot simply order states to pass certain laws or administer federal programs. This became known as the anti-commandeering doctrine.
Printz v. United States (1997): Building on New York v. United States, the Court struck down a provision of the Brady Handgun Violence Prevention Act that required local sheriffs to conduct background checks. The federal government couldn’t force state officers to enforce federal law.
United States v. Lopez (1995): The Court struck down the Gun-Free School Zones Act, ruling that Congress had gone beyond its Commerce Clause power. The case was a landmark reassertion of limits on federal authority — and a win for reserved powers.
These cases don’t mean states can do anything they want. But they show that the Tenth Amendment is a living part of constitutional law — not just a historical footnote.
Why Reserved Powers Still Matter in 2026
It’s tempting to think of the Tenth Amendment and reserved powers as historical concepts — something the Founders cared about, but largely settled by now. That couldn’t be further from the truth.
Some of the biggest political and legal debates happening right now turn directly on the question of what states can do versus what the federal government can control.
Marijuana legalization. Federal law still classifies marijuana as a Schedule I controlled substance. Yet dozens of states have legalized it for recreational or medical use under their reserved powers. The tension between state law and federal law here is ongoing and unresolved.
Healthcare and Medicaid. When the Affordable Care Act passed, the Supreme Court ruled that the federal government couldn’t force states to expand Medicaid by threatening to take away all their existing Medicaid funding. That was a Tenth Amendment decision — protecting states from federal coercion.
Immigration enforcement. Several states have passed laws either limiting or expanding cooperation with federal immigration authorities. Both sides of this debate invoke reserved powers and federal supremacy.
Education policy. From curriculum standards to school choice programs to book policies in libraries, education remains a deeply contested space where federal guidelines and state authority constantly interact.
Reserved powers aren’t a relic. They are the legal framework through which these battles are fought. Every time a governor says “our state will not comply,” or a state attorney general challenges a federal rule in court, they are invoking the same constitutional principle the Founders put into the Tenth Amendment more than 230 years ago.
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