United States Constitution
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The Constitution of the United States is the supreme law of the United States of America . [ 1 ] The first three Articles of the Constitution establish the rules and separate powers of the three branches of the federal government: a legislature, the bicameral Congress ; an executive branch led by the President ; and a federal judiciary headed by the Supreme Court . The last four Articles frame the principle of federalism . The Tenth Amendment confirms its federal characteristics . The Constitution was adopted on September 17, 1787, by the Constitutional Convention in Philadelphia, Pennsylvania, and ratified by conventions in eleven states .