The famous document that announced the independence of the United States from Britain is the Declaration of Independence. Drafted primarily by Thomas Jefferson, this document was adopted by the Continental Congress on July 4, 1776. It articulates the colonies' grievances against King George III and asserts the inherent rights of individuals, including the pursuit of life, liberty, and happiness. This declaration not only marked the colonies' separation from British rule but also laid the philosophical foundation for democracy and individual rights, influencing other nations and revolutionary movements in the years to come.