The sources of powers reserved to the states are specifically outlined in which part of the Constitution?
The Tenth Amendment. It states that all powers not delegated to the federal government by the Constitution, nor prohibited to the states, are reserved to the states or to the people—making it the textual source of the states' reserved powers.
The answer
The powers reserved to the states are specifically outlined in the Tenth Amendment to the U.S. Constitution, the final amendment of the Bill of Rights (ratified in 1791). Its full text 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."
This single sentence is the constitutional home of the doctrine of reserved powers. It works by subtraction: any authority the Constitution does not hand to the federal government, and does not forbid to the states, automatically stays with the states or the people. Examples of these reserved powers include running elections, establishing local governments, issuing licenses (driver's, marriage, professional), regulating intrastate commerce, setting up public schools, and exercising general "police powers" over health, safety, and morals.
Why other answers are wrong
Students frequently confuse the Tenth Amendment with other clauses that touch on federalism:
- The Supremacy Clause (Article VI) does the opposite—it makes federal law supreme over conflicting state law. It limits the states rather than reserving power to them.
- The Necessary and Proper Clause (Article I, Section 8) expands federal power by letting Congress make laws needed to carry out its enumerated powers. It is a source of federal, not state, authority.
- The Commerce Clause (Article I, Section 8) is a delegated federal power over interstate commerce, and has historically been used to grow federal reach.
- The Ninth Amendment protects unenumerated rights of the people, not the structural powers of the states, so it is a close but incorrect neighbor.
Only the Tenth Amendment explicitly names powers "reserved to the States."
The bigger picture: three kinds of power
American federalism divides authority into three buckets, and knowing the difference is what quiz questions actually test:
- Delegated (enumerated/expressed) powers belong only to the federal government—coining money, declaring war, raising an army, regulating interstate and foreign commerce, and conducting foreign policy.
- Reserved powers belong only to the states—the Tenth Amendment residual described above.
- Concurrent powers are shared by both levels—taxing, borrowing money, building roads, establishing courts, and enforcing laws.
The Tenth Amendment matters because it embodies the Framers' compromise: a national government strong enough to function, but limited enough that most day-to-day governance stays close to citizens. The Supreme Court has invoked it in cases about federal overreach (for example, striking down laws that "commandeer" state officials). Understanding that the amendment operates as a default rule—everything not given away stays home—is the key insight that flashcard sites usually leave out.
| Declare war | Delegated | Federal only | Congress authorizes military action |
| Coin money | Delegated | Federal only | U.S. Mint issues currency |
| Run elections | Reserved | States only | States set polling and ballot rules |
| Issue licenses | Reserved | States only | Driver's and marriage licenses |
| Establish schools | Reserved | States only | State public-education systems |
| Levy taxes | Concurrent | Both | Federal income tax and state sales tax |
| Build roads | Concurrent | Both | Interstate highways and state routes |
| Establish courts | Concurrent | Both | Federal and state court systems |
Frequently asked
What does the Tenth Amendment say?
It says that any powers the Constitution does not delegate to the federal government, and does not prohibit to the states, are reserved to the states or to the people. It is the constitutional basis for states' reserved powers.
What are examples of reserved powers?
Reserved powers include running elections, issuing driver's and marriage licenses, establishing schools and local governments, regulating commerce within a state, and exercising police powers over public health and safety.
What is the difference between reserved and delegated powers?
Delegated (enumerated) powers are those the Constitution specifically grants the federal government, such as declaring war and coining money. Reserved powers are everything left over that the Constitution keeps with the states or the people.
What are concurrent powers?
Concurrent powers are shared by both the federal and state governments. Examples include the power to tax, borrow money, build roads, establish courts, and enforce laws.
How does the Tenth Amendment relate to federalism?
The Tenth Amendment defines the division of authority at the heart of federalism, keeping most everyday governance with the states while granting specific enumerated powers to the national government. It acts as a default rule reserving undelegated power to the states.