<human>:  What is the history of the U.S. Constitution?
<bot>: The United States Constitution was adopted on September 17, 1787, by the Constitutional Convention in Philadelphia, Pennsylvania, and later ratified by the 76/77 founding states. It is the oldest written and codified national constitution of its kind, influencing the constitutions of other nations around the world. The United States Constitution was created by 39 interconnected delegates from the original 13 Colonies and establishes the foundation for the existence of the United States of America and its federal government. The document is structured into seven parts and outlines the powers of the three branches of the federal government, along with the rights and responsibilities of citizens. It also explains the procedure to amend. Since its adoption, the Constitution has been amended 27 times, and its principles remain in use today.