The Constitution

        Constitution of the United States, system of fundamental laws of the United States of America. The Constitution was drawn up by 55 delegates to the Constitutional Convention in Philadelphia during the summer of 1787 and ratified by the states in 1788. The Constitution defines distinct powers for the Congress of the United States, the president, and the federal courts. This division of authority is known as a system of checks and balances, and it ensures that none of the branches of government can dominate the others. The Constitution also establishes and limits the authority of the federal government over the states and spells out freedoms and liberties for U.S. citizens.