<human>:  What is the history behind the U.S. Constitution?
<bot>: The United States Constitution was adopted in 1787, after the Revolutionary War, and has since been the foundation for the laws of the United States. It was written, debated, and ratified by the delegates of the Constitutional Convention, which included James Madison, Alexander Hamilton, George Washington, and Benjamin Franklin. The Constitution established a federal government with three branches, the executive, legislative, and judicial. It also outlined the basic rights of U.S. citizens. The Constitution was amended 27 times and serves as the supreme law of the United States. It has been described as the world's most influential document, and the oldest written constitution still in use.