Born from a long and costly struggle, the United States Constitution was signed on September 17, 1787. 55 delegates from twelve of the the states (Rhode Island did not participate) met and through long and arduous hours developed the Constitution. 39 of the delegates signed it. It was finally ratified by the states and took effect in 1789. It is the form of government that we have today. I am always amazed that this group of men could write something that we live by 219 years later.
The Department of Defense has a great mini course on the Constitution - you can even print out a certificate of completion if you want to!
For lots of information, visit the National Archives site.
Today is Constitution Day - a much forgotten day in modern America, but a day that gave us all that we still hold dear.