US courts of appeal
Level 3 : Supreme Court
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the Tigris and Euphrates rivers in the middle east
Either a two-thirds vote of both houses of Congress or a national convention can propose an amendment to the Constitution. Article V of the Constitution says, "The Congress, whenever two-thirds of both houses shall deem it necessary, shall propose amendments to this Constitution, or, on the application of the legislatures of two-thirds of the several states, shall call a convention for proposing amendments." (Note: The second method for proposing an amendment has only been used for repeal of the 21st Amendment (Prohibition).)