Article V of the U.S. Constitution establishes the process for making changes to the Constitution. It sets out two routes for proposing amendments—a two-thirds vote in both chambers of Congress, or a constitutional convention called by two-thirds of state legislatures—and two routes for ratifying them: approval by three-fourths of state legislatures or by conventions in three-fourths of the states.

The Two-Stage Architecture of Article V

Article V divides amendment-making into proposal and ratification. The proposal stage generates the text. The ratification stage converts text into binding constitutional law. Both stages must succeed, and they draw on different institutions by design.

The default proposal route is congressional. Two-thirds of each chamber must approve a joint resolution proposing an amendment. In the current 435-member House, that threshold is 290 votes. In the 100-member Senate, it is 67. The president plays no formal role; a proposed amendment is not presented for signature or veto.

The alternative proposal route is a convention summoned by state legislatures. If two-thirds of the states—34 today—apply to Congress for a convention, Congress must call one. The Constitution does not specify how such a convention would be organized, how delegates would be selected, or whether its agenda could be limited to a single subject. That silence is the source of the deepest legal uncertainty in American constitutionalism.

The Supreme Court endorsed the basic structure in 1798, holding in Hollingsworth v. Virginia that the Constitution's own text controls amendment and that no presidential approval is needed. The architecture has survived unchanged since 1789 despite roughly 11,000 amendment proposals introduced in Congress, only 33 sent to the states, and 27 ratified.

Quantified Context: How Rarely Ratification Succeeds

The numbers show how demanding Article V is. Of the 27 ratified amendments, the first 10—the Bill of Rights—were ratified in 1791 as a package. The remaining 17 arrived over 230 years. The 27th, concerning congressional pay, took 202 years and seven months to ratify, from 1789 to 1992.

Ratification requires three-fourths of the states. That threshold has moved as the country grew. In 1791 there were 14 states, so 11 had to approve. Today, with 50 states, 38 must approve. Each time a state joins the Union, the absolute number required rises, though the fraction stays fixed.

Congress chooses the ratification mode when it proposes an amendment: legislatures or state conventions. Thirty-eight of the 50 states must agree under whichever mode is selected. Of the 27 ratified amendments, 26 went through state legislatures; only the 21st, repealing Prohibition in 1933, used state conventions. Congress gave that amendment a seven-year deadline, and it was ratified in about ten months.

Congress also sets time limits with growing regularity. The 18th, 20th, 21st, and 22nd amendments carried deadlines, and the 23rd through 26th did as well. The Equal Rights Amendment, passed by Congress in 1972 with a seven-year deadline later extended to 1982, fell short of 38 states in that window—and whether it can be revived is still contested.

Edge Cases That Test Article V

Two unresolved questions carry outsized weight. First, can Congress place substantive limits on a convention's agenda? Second, can a state rescind its ratification before the threshold is reached?

On convention scope, the text says only that Congress "shall call a Convention for proposing Amendments." Nothing in the document restricts the subject matter. Over 400 state applications for a convention have been filed across American history, on topics from a balanced budget to term limits. Because Article V does not settle the question, a convention's authority would likely be resolved by politics and litigation rather than by text.

On rescission, the record is mixed. During the ERA ratification fight, several states voted to withdraw approval. The Supreme Court took up the question in 1981 but dismissed the case as not yet ripe after the deadline expired, leaving no controlling answer. Idaho v. Freeman had earlier held rescissions valid, but that judgment was vacated on procedural grounds. The result is that no authoritative rule governs whether a withdrawal counts.

A third edge case concerns time. Article V itself sets no deadline, and the 27th Amendment is the proof: it lay dormant for two centuries before reaching the threshold. Congress must therefore impose time limits if it wants them, and it has done so for decades, but it cannot bind a future Congress through a limit in the amendment text alone.

Misconceptions Worth Correcting

The most common misconception is that the president signs amendments. He or she does not. A joint resolution proposing an amendment goes straight to the states after congressional passage. The National Archives administers ratification, and the Archivist publishes the amendment once the threshold is met; the president's signature is absent from the process.

A second misconception holds that a convention would be a runaway body with unlimited power. The text neither authorizes nor forbids agenda limits. Legal scholars divide sharply. The practical safeguard is political: 34 states would have to agree even to convene, and 38 to ratify anything a convention produced.

Warn against treating Article V counts as fixed: the 38-state threshold scales with the number of states. Warn against assuming a state's ratification is irrevocable: the rescission question is unsettled. Warn against assuming a convention's scope is settled: the mechanism has never been used. Warn against reading a time limit into Article V: deadlines are congressional choices, not constitutional text. Warn against counting amendment proposals as progress: only 33 of roughly 11,000 have cleared Congress.

A counterintuitive detail: the process that produced the Constitution itself was not an Article V amendment. The Constitutional Convention of 1787 met under the Articles of Confederation, not the Constitution, and the ratification procedure it devised was avowedly irregular. Article V governs amendments to the Constitution; it does not explain how the document was created.

Practical Actions for Tracking an Amendment

For officials, journalists, and citizens tracking a proposed amendment, a few thresholds matter. Count to 290 in the House. Count to 67 in the Senate. Count to 34 states for a convention application. Count to 38 for ratification.

Verify the proposal stage first. Confirm that both chambers reached two-thirds, not just a simple majority. Identify the ratification mode. Congress chooses legislatures or conventions; the mode changes who votes and when. Track rescissions explicitly. If any state has withdrawn, treat the count as contested rather than final. Check for a deadline. A seven-year window is common, and an amendment outside it faces a harder path. Confirm the official record. The Archivist of the United States publishes ratification counts and the final certification.

Where Article V's Authority Ends

Article V is silent on several matters that shape outcomes. It does not describe convention procedure. It does not resolve rescission. It does not set a time limit. It does not protect ratified language from later amendment. These gaps are not flaws so much as deliberate delegations to Congress and the courts.

One limit is absolute: Article V protects the slave trade clause until 1808, and no other subject is expressly shielded from amendment. Even the structure of the Senate, which gives each state two votes regardless of population, is not entrenched; it is protected only by the difficulty of the process itself. That is the design: amendment is possible, but not easy.

The pattern to carry away is that Article V is a gatekeeping device. It channels change through two supermajority thresholds—two-thirds to propose, three-fourths to ratify—while leaving the conventions and rescissions that test its edges to be settled outside the text.