The document that announced the break from Britain during the American Revolution was the Declaration of Independence, adopted on July 4, 1776. Drafted primarily by Thomas Jefferson, this foundational text articulated the American colonies' grievances against King George III, asserting the colonies' right to self-govern and establish their sovereignty. The Declaration enshrined the principles of individual liberty and equality, with famous lines about the rights to "life, liberty, and the pursuit of happiness." It served not only as a rallying point for the revolution but also established a framework for the ideals of democracy that would shape the future United States.