On September 17, 1787 thirty-nine delegates to the Constitutional Convention signed the document known as the Constitution of the United States.  These delegates worked most of the summer to create a document that defined government powers, from federal to state, and how the representatives of the people should be elected.

Weblinks:

Celebrate Constitution Day!
From the National Archives, a website celebrating the Constitution, our central Charter of Freedom

Constitution Day Information
Read more about Constitution Day and the background information on the U.S. Constitution

United States Constitution
See a copy of the United States Constitution

Constitution Day Activities
A page of activities related to the Constitution

The Dawn of a Democracy: The Constitution
A powerpoint of the events leading up to the signing of the Constitution

Other Sites to try:

Important American Historical Documents
100 milestone documents of American history

USA.gov
Whatever you want or need from the U.S. government:  a rich treasure of online information, services and resources