Final answer:
Amendments to the Constitution can be proposed by Congress with a two-thirds majority or by State legislatures through a national convention, requiring three-fourths ratification by states.
Explanation:
Amendments to the Constitution of the United States can be proposed by Congress with a two-thirds majority in both the House and the Senate, or by the State legislatures of two-thirds of the States requesting a national convention. If approved, amendments must then be ratified by three-fourths of the states to become part of the Constitution.
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