How Are Amendments Made To The U.S. Constitution?

According to the Constitution, the Amendments to it can be initiated either by the Congress (with a two-thirds majority vote in both houses), or by a constitutional convention. None of the existing amendments was made by the convention. The President of the United States has no role in the process of developing and adopting Amendments. After a project of an Amendment is proposed, it is sent directly to the NARA's Office of the Federal Register (OFR). There it is processed into a slip law, and its copies are sent to all of the states; an Amendment becomes a part of Constitution in case if three-fourths of the American states ratify it.