Among other things, mainly physical or medical, a Constitution embodies the fundamental principles on which a state is governed, especially when considering the rights of its subjects. Therefore the Unites States Constitution embodies the conception on which the American system of government is based. Most great countries have a written constitution, with the notable exclusion from the list of Great Britain.
In America the Constitution has been the law of the land since 1789; it established a federal republic, with the intention of balancing the power of the states and that of the federal government. In the latter, power is divided among three independent branches – legislative, executive and judicial. The Document contains a brief preamble followed by seven articles which include: the organization, powers and procedures of Congress (the legislative branch); the powers of the elected President and his/her executive; powers of the judiciary (judges) which include the Supreme Court; the rights of the states, and correct procedures for amending the Constitution.
The articles are followed by the amendments; many of the first amendments are to do with the Bill of Rights, while later ones deal with civil rights issues. Others cover concerns such as the election, death or removal (impeachment) of the President, and eligibility to stand for a seat in Congress.
It was drafted at the Constitutional Convention held at Philadelphia in 1787, and adopted after ratification by nine of the states.