An amendment is an addition, deletion of modification of the contents of the U.S. Constitution. It can be ratified through a majority vote of two-thirds in both legislature houses, and by a constitutional convention.
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It can ratify an amendment either by its legislature or by a special convention set up to ratify it. Congress decides which way it is to be when it proposes the amendment for ratification. See Article V of the US Constitution
Either 2/3 of all states can agree to ratify the amendment or 2/3 of all the states conventions held for the amendment have to agree.
Assuming this question is about the US constitution: The constitution can only be amended, existing text cannot be modified or deleted. However, amendments can invalidate previous parts (for instance, the 21st amendment repealed the 18th amendment). There are two ways to start an amendment: One is for both houses of the US Congress must pass the amendment with a two-thirds majority. The second is for two-thirds of the states to vote to convene a constitutional convention which will draft the amendment (the latter method has never been used successfully). After either of those occur, three-fourths of the states must vote to ratify the amendment. This can either be done by votes in the state legislatures, or be requiring that each state convene a special convention to ratify the amendment (the latter method has only been successfully used to ratify the 21st amendment).
Article V in the Constitution spells out the ways how a Constitution can be amendment or changed. All of the 27 amendments have been proposed by two-thirds vote of both houses of Congress, and only the Twenty-first Amendment was ratified by constitutional conventions of the states. All other amendments have been ratified by state legislature.
Regardless of which of the two proposal routes is taken, the amendment must be ratified, or approved, by three-fourths of states. \STATES
9 out of 13 states had to approve or ratify. The process was called ratification
2/3rds majority in both the US House and Senate are required to propose an amendment to the US Constitution. Once passed by Congress, the amendment requires ratification of 3/4ths of the States to become law.