The constitution was adopted on September 17, 1787. Thomas Jefferson, John Adams, and James Madison, are among the several important leaders who aided in composing it. It is the supreme guiding law of the United States. The constitution created our judicial branches, Supreme Court and all governing laws of the country. It is believed to have been actually written in the 1600’s and was then referred to as the Statutes of 1600. But the constitution we have in effect in the United States today was adopted in 1787.