Constitution of the United States
The Constitution of the United States is the supreme law of the United States of
America. It is the framework for the organization of the United States government and
for the relationship of the federal government with the states, citizens, and all people
within the United States.
The first three Articles of the Constitution establish the three branches of the national
government: a legislature, the bicameral Congress; an executive branch led by the
President; and a judicial branch headed by the Supreme Court. They also specify the
powers and duties of each branch. All unenumerated powers are reserved to the
respective states and the people, thereby establishing the federal system of
government.
The Constitution was adopted on September 17, 1787, by the Constitutional
Convention in Philadelphia, Pennsylvania, and ratified by conventions in each U.S.
state. The first ten amendments are known as the Bill of Rights.