The Constitution of the United States of America is the supreme law of the United States. It is the foundation and source of the legal authority underlying the existence of the United States of America and the federal government of the United States. It provides the framework for the organization of the United States government and for the relationship of the federal government to the states, to citizens, and to all people within the United States.
The United States Constitution was adopted on September 17, 1787, by the Constitutional Convention in Philadelphia, Pennsylvania, and ratified by conventions in each U.S. state in the name of "The People". The Constitution has been amended twenty-seven times; the first ten amendments are known as the Bill of Rights.