The United States Declaration of Independence is a statement adopted by the Continental Congress on July 4, 1776, which announced that the thirteen American colonies then at war with Great Britain were now independent states, and thus no longer a part of the British Empire. Written primarily by Thomas Jefferson, the Declaration is 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 Declaration justified the independence of the United States by listing colonial grievances against King George III, and by asserting certain natural rights, including a right of revolution. Having served its original purpose in announcing independence, the text of the Declaration was initially ignored after the American Revolution.