Changes to the U.S. Constitution happen through amendments, which are official additions or modifications to the existing document. This amendment process starts when Congress proposes an amendment with a two-thirds vote in both the House and Senate, or when two-thirds of state legislatures call for a constitutional convention.
Section "Learn and Explore" uses official instructions and media files of US Citizenship and Immigration Services, US National Museum of American History, The Smithsonian Institution and other governmental and public organization.