September 17, 1787 - Finally, there is a Constitution of the United States of America. It determined how the country will make laws, elect representatives, and defend against its enemies in times of war. The men who drafted the Constitution wisely provided a way to make future changes, called amendments. But more work lies ahead. Only when 2/3 of the states approve, or ratify, the Constitution will it become law. Will nine states ratify it?