The historical document signed in 1776 is the Declaration of Independence. Adopted by the Continental Congress on July 4, 1776, this pivotal document announced the American colonies' separation from British rule. Drafted primarily by Thomas Jefferson, the Declaration articulated the colonies' grievances against King George III and expressed the fundamental principles of individual rights and government by consent. It famously includes the assertion that "all men are created equal," laying the groundwork for democracy and human rights. The signing of the Declaration marked the beginning of the United States’ quest for independence and has since become a symbol of freedom worldwide.