Constitution Day is observed each year on September 17 to commemorate the date on which thirty-nine delegates to the Constitutional Convention, held in Philadelphia, Pennsylvania, signed the United States Constitution in 1787.  The Convention was convened as a result of dissatisfaction with the Articles of Confederation, the first constitution of the United States.  For deeper coverage on the world’s longest surviving written charter of government, download the Library of Congress’s free app containing the official, annotated version of the United State Constitution, U.S. Constitution: Analysis and Interpretation.

The original Constitution is held at the National Archives in Washington, D.C. but you can pick up your own pocket-copy at the library’s reference desk!