The Constitution was adopted on September 17, 1787, by the Constitutional Convention in Philadelphia, Pennsylvania, and ratified by conventions in eleven states. It went into effect on March 4, 1789. The first ten amendments are known as the Bill of Rights. The Constitution has been amended seventeen times (for a total of 27 amendments) and its principles are applied in courts of law by judicial review.
The Declaration of Independence was a statement adopted by the Continental Congress on July 4, 1776, which announced that the thirteen American colonies, then at war with Great Britain, regarded themselves as independent states, and no longer a part of the British Empire. John Adams put forth a resolution earlier in the year which made a formal declaration inevitable. A committee was assembled to draft the formal declaration, to be ready when congress voted on independence. Adams persuaded the committee to select Thomas Jefferson to compose the original draft of the document, which congress would edit to produce the final version. The Declaration was ultimately a formal explanation of why Congress had voted on July 2 to declare independence from Great Britain, more than a year after the outbreak of the American Revolutionary War. The Independence Day of the United States of America is celebrated on July 4, the day Congress approved the wording of the Declaration.