To pass a Constitutional amendment beyond Congressional approval, ratification by 38 states is required.
To pass a Constitutional amendment in addition to approval by Congress, ratification by 38 states is needed.
Amendments can originate from Congress with approval by two-thirds majority in both the House and the Senate. If three-quarters of state legislatures approve, the amendment becomes part of the Constitution. Alternatively, states can petition Congress for a convention to propose amendments, which then need three-quarters ratification.
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