That would be article 1
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Congress.
Article III of the Constitution
the addition of amendments to the constitution by congress
Article V. Either Congress or the states (in constitutional convention) PROPOSE amendments, but only the states ratify. Once the states ratify, the Constitution IS changed - Congress has no role following ratification. The states never need Congress's permission to amend.
Article 1 is the longest article of the Constitution because it is the most important. This is what the U.S. government is a lot about: the Congress. The Congress has nearly all powers and to list them all, Article 1 has to quite long.