The document that proclaimed the United States' desire for independence from Britain was the Declaration of Independence, adopted on July 4, 1776. Drafted primarily by Thomas Jefferson, the Declaration articulates the colonies' grievances against King George III and asserts the philosophical foundation for independence, emphasizing natural rights such as life, liberty, and the pursuit of happiness. The Declaration served not only as a formal announcement of separation but also as a powerful statement of democratic ideals. It galvanized support for the American Revolution and has since become a symbol of freedom and democracy, inspiring movements worldwide.