Amendments
The First Federal Congress took up the question of a bill of rights almost immediately. Congress proposed twelve amendments to the states. Ten of these were added to the Constitution on December 15, 1791.
The Bill of Rights that is on permanent display here is the Joint Resolution passed by Congress on September 25, 1789, proposing twelve–not ten–amendments. The first article, concerning the ratio of constituents to each congressional representative, was never ratified by the states; the second article listed, concerning congressional pay, was ratified in 1992 as the Twenty-seventh Amendment.