Neither the federal government nor the states hold unlimited power: the Constitution grants authority to the national government, reserves other powers to the states and the people, and sets rules for resolving conflicts between them. Where power ends depends on the constitutional limits that apply to a particular issue and how courts interpret them.
That division shapes disputes over policy, elections and the reach of government. Understanding the Constitution and states’ rights means looking beyond slogans to how federal authority, state powers and constitutional protections interact. For a closer look at that relationship in practice, read our related article, “How States Shape United States Politics Through Elections, Policy, and Federal Bargaining.”
| Provision | What it addresses | Concrete rule |
|---|---|---|
| Article I, Section 10 | Express limits on states | Bars state treaties and coinage |
| Tenth Amendment | Reserved authority | Reserves powers not delegated or prohibited |
| Fourteenth Amendment | Limits on state treatment of persons | Requires due process and equal protection |
| Article IV | Relations among states | Establishes parameters for state relations |
- 10th Amendment Constitutional provision reserving powers not delegated to the United States or prohibited to the states
- 14th Amendment Constitutional provision containing due-process and equal-protection limits on states
- Article I, Section 10 Constitutional section cataloguing prohibitions and limitations on state power
- 2/3 of Senators present Senate approval threshold for a treaty, as described in the provided constitutional summary
What does the Constitution mean by states’ rights?
States’ rights mean the authority the Constitution leaves to state governments or the people, rather than granting it to the federal government or forbidding it to the states. The Tenth Amendment sets out that reservation, but it does not make state power unlimited: the Constitution’s other provisions also allocate and restrict government authority.
How the Constitution divides and limits power
Congress’s legislative powers are enumerated in Article I, while Article II sets out presidential powers; the Tenth Amendment must be read alongside both. Article IV establishes constitutional rules for relations among states, so state authority operates within a framework governing the states as well as the federal government.
The constitutional test is whether a particular power is assigned to the federal government, left to states or the people, or constrained by another constitutional provision. For example, Article I, Section 10 bars states from making treaties, coining money, and passing ex post facto laws. The Fourteenth Amendment also restricts state action by requiring due process and equal protection. These provisions show why the Tenth Amendment is not a blanket permission: a power reserved to states remains subject to explicit limits elsewhere in the Constitution.
Which powers does Article I, Section 10 deny to states?
Article I, Section 10 denies states the power to conduct specified foreign relations, issue their own money or credit, set legal tender outside gold and silver coin, enact certain kinds of laws, or grant titles of nobility. These are express constitutional prohibitions; they differ from the Tenth Amendment, which reserves to the states or the people powers not delegated to the federal government.
Foreign relations and currency
Clause 1 bars each state from making a treaty, alliance or confederation, granting letters of marque and reprisal, or coining money. It also prohibits states from emitting bills of credit and from making anything other than gold and silver coin a tender for payment of debts.
- Foreign affairs: a state cannot enter a treaty, alliance or confederation, or grant letters of marque and reprisal.
- Money and debt: a state cannot coin money, emit bills of credit, or declare something other than gold and silver coin legal tender for debts.
Limits on state lawmaking
Article I, Section 10 also forbids states from passing bills of attainder, ex post facto laws, or laws that impair the obligation of contracts. It separately bars a state from granting titles of nobility. Together, these restrictions mark specific limits on state action; they are not a general list of powers reserved to states under the Tenth Amendment.
How does the Fourteenth Amendment limit state laws?
The Fourteenth Amendment limits state laws by barring states from denying any person within their jurisdiction due process of law or the equal protection of the laws. These guarantees constrain state action, so a law’s impact on people who are not U.S. citizens can also raise Fourteenth Amendment questions.
Citizenship and protections against the states
The opening section of the Fourteenth Amendment also defines citizenship: people born or naturalized in the United States and subject to its jurisdiction are citizens of the United States and of the state where they reside. Its citizenship rule and its protections for “any person” are distinct: equal protection and due process are not limited to citizens.
The Supreme Court has interpreted the Fourteenth Amendment to apply most Bill of Rights protections to state governments. As a result, the amendment is a constitutional route for applying those protections against states, alongside its own guarantees of due process and equal protection. Together, these provisions limit what state laws and state officials may do.
How do federal and state authority fit together?
Federal authority comes from powers assigned by the Constitution, while the Tenth Amendment reserves powers not delegated to the federal government to the states or the people, subject to constitutional limits on states. Article I sets out Congress’s enumerated powers; Article II separately identifies presidential powers. This structure makes federal authority depend on constitutional grants rather than a general power over every area of government.
Limits and relations among states
The Tenth Amendment does not exempt states from other constitutional restrictions. Article I, Section 10 bars states from making treaties or coining money, among other specified acts, and the Fourteenth Amendment prohibits states from denying any person due process or equal protection of the laws. Article IV sets rules for relations among the states, complementing those limits without replacing the powers reserved to them.
Federal and state authority therefore operates through both delegated powers and constitutional boundaries: the federal government acts under powers assigned to it, while states retain authority outside those grants unless the Constitution restricts it. For a fuller account of elections, policy and federal bargaining, see our related article, “How States Shape United States Politics Through Elections, Policy, and Federal Bargaining.”
When does a states’ rights claim meet a constitutional limit?
A state’s reserved powers end where the Constitution expressly forbids state action or imposes a federal constitutional limit, including Article I, Section 10, and the Fourteenth Amendment. The Tenth Amendment does not give states unrestricted authority: it reserves powers not delegated to the United States or prohibited to the states.
The limit of the reservation
Article I, Section 10 sets specific prohibitions, including making anything other than gold and silver coin legal tender for debts, passing a law impairing contractual obligations, and granting titles of nobility. A state cannot use a claim of reserved authority to escape those express limits.
The Fourteenth Amendment separately constrains state laws through due process and equal protection. To assess a particular state action, identify the constitutional rule that applies: Article I, Section 10 may bar a specified kind of state measure, while the Fourteenth Amendment requires attention to how the law treats people and affects their rights.
- Express prohibition: Article I, Section 10 bars specified actions, including state treaties and bills of attainder.
- Rights-based limit: The Fourteenth Amendment imposes due-process and equal-protection requirements on states.
- Reserved authority: The Tenth Amendment covers powers not delegated to the United States or prohibited to the states; it is not blanket permission for state action.
- Policy disagreement: Disagreement with a state policy alone does not settle the constitutional question; the governing provision must be identified for that specific action.
What should readers check when assessing a state-power dispute?
Assess a state-power dispute by identifying the challenged state action, testing it against specific constitutional limits, and then asking whether the federal government has authority over the same subject. The Constitution supplies distinct checks: Article I, Section 10 lists powers states may not exercise; Article I addresses powers delegated to Congress; Article II sets out presidential powers; and the Fourteenth Amendment restricts how states may treat people.
- Identify the action: Name the state law, policy, or decision at issue, then check whether Article I, Section 10 expressly bars it. The list includes making treaties, coining money, passing ex post facto laws, and impairing contractual obligations.
- Locate federal authority: Ask whether the dispute concerns a power delegated to Congress under Article I or a power assigned to the president under Article II. These are separate constitutional grants, so identify which one is relevant rather than treating federal authority as a single category.
- Examine individual rights: If the state’s treatment of a person is challenged, apply the Fourteenth Amendment’s Due Process and Equal Protection Clauses. They restrict state action affecting a person’s legal process or equal treatment under law.
- Apply the Tenth Amendment in context: It reserves powers not delegated to the federal government to the states or the people, but it does not erase Congress’s delegated powers or constitutional restrictions on states.
Questions readers ask
Does the Tenth Amendment give states unlimited power?
Can a state make a treaty with a foreign country?
Can a state make its own money?
Does the Fourteenth Amendment restrict state governments?
Key takeaways
- The Tenth Amendment reserves undelegated powers, but does not cancel other constitutional limits.
- Article I, Section 10 bars state treaties, state coinage and specified kinds of state laws.
- The Fourteenth Amendment constrains state action through due-process and equal-protection guarantees.
- Article I, Article II and Article IV help identify the constitutional lane relevant to a dispute.
Sources
- congress.gov — “Constitutional Limits on States’ Power over Foreign Affairs”
- U.S. Vote Foundation — “State Government Powers”
- Annenberg Classroom — “Constitution: What It Says, What It Means Archives”
- Constitution Center — “Article I – Legislative Branch”
- senate.gov — “Constitution of the United States”
