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 May 25, 1787: The Constitutional Convention opens with a quorum of seven states in Philadelphia to discuss revising the Articles of Confederation. Eventually all states but Rhode Island are represented.

Sept. 17, 1787: All 12 state delegations approve the Constitution, 39 delegates sign it of the 42 present, and the Convention formally adjourns.

June 21, 1788: The Constitution becomes effective for the ratifying states when New Hampshire is the ninth state to ratify it.

March 4, 1789: The first Congress under the Constitution convenes in New York City.

April 30, 1789: George Washington is inaugurated as the first President of the United States.

June 8, 1789: James Madison introduces proposed Bill of Rights in the House of Representatives.

Sept. 24, 1789: Congress establishes a Supreme Court, 13 district courts, three ad hoc circuit courts, and the position of Attorney General.

Sept. 25, 1789: Congress approves 12 amendments and sends them to the states for ratification.

Feb. 2, 1790: Supreme Court convenes for the first time after an unsuccessful attempt February 1.

Dec. 15, 1791: Virginia ratifies the Bill of Rights, and 10 of the 12 proposed amendments become part of the U.S. Constitution. 40