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Three fourth of the states must must ratify an amendment for it to be added to the constitution.
An amendment must be ratified by the legislature of three-quarters of the states, or by ratifying conventions held in three-quarters of the states, as specified by Congress. This process has only been used once in American history, with the ratification of the 21st Amendment in 1933.
As soon as 3/4th of the States ratify a proposed amendment, it becomes a part of the Constitution (38 of 50 States). The OFR creates an official declaration for the Archivist to verify that the amendment is legal and has been incorporated into the Constitution once it confirms that it has obtained the necessary quantity of authenticated ratification documents.
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