The historic document signed by Thomas Jefferson declaring the colonies free from British rule is the Declaration of Independence. Adopted on July 4, 1776, this document expresses the colonies' desire for independence and outlines their grievances against King George III. It emphasizes the principles of individual rights and the concept of government based on the consent of the governed. The Declaration fundamentally shaped American identity and democratic ideals, influencing not only the course of the American Revolution but also subsequent democratic movements worldwide.