To be clear, Congress can only propose an amendment with a 2/3 favorable vote in both Houses. Each state then has the right to ratify or reject a proposed amendment before it can be added to the Constitution.
States have the right of petitioning Congress to call a constitutional convention. Should the legislatures of at least 34 states propose an amendment to Congress, Congress must convene a Constitutional Convention. (This has never happened).
Amendments proposed by Congress or or proposed by state legislatures in a Constitutional Convention become valid only when ratified by the legislatures of, or conventions in, three-fourths of the states.
https://www.ncsl.org/research/about-state-legislatures/amending-the-u-s-constitution.aspx
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