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We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.

On September 17, 1787, the delegates to the Constitutional Convention met for the last time to sign the document they had created. Citizens across the nation recognize September 17 as Constitution Day.

Resources:

The Constitution Center - An online, interactive Constitution 

The National Archives - Transcript, analysis and history of the Constitution