The Constitution can be amended through the following processes:
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Congressional Proposal: An amendment is proposed by a two-thirds majority vote in both the House of Representatives and the Senate.
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State Ratification: The proposed amendment is ratified by three-fourths (38 out of 50) of the state legislatures or by conventions in three-fourths of the states.
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National Constitutional Convention: Alternatively, an amendment can be proposed by a national convention called by two-thirds of state legislatures, though this method has never been used.
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No Time Limit: Once proposed, amendments do not have a time limit for ratification unless specified by Congress.