The most common method for amending the constitution has been approval by ________.

If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

In order to continue enjoying our site, we ask that you confirm your identity as a human. Thank you very much for your cooperation.

Measures Proposed to Amend the Constitution

Proposed Amendments Not Ratified by the States(pdf)

Discussion of Article V (pdf)

Under Article V of the Constitution, there are two ways to propose and ratify amendments to the Constitution. To propose amendments, two-thirds of both houses of Congress can vote to propose an amendment, or two-thirds of the state legislatures can ask Congress to call a national convention to propose amendments. To ratify amendments, three-fourths of the state legislatures must approve them, or ratifying conventions in three-fourths of the states must approve them.

The Supreme Court has said that ratification must be within "some reasonable time after the proposal." Beginning with the 18th amendment, Congress traditionally set a definite period for ratification. In the case of the 18th, 20th, 21st, and 22nd amendments, the period set was seven years, but there has been no determination as to just how long a "reasonable time" might be.