The pivotal document marking the declaring of the independence of the American colonies from British rule is the Declaration of Independence, adopted on July 4, 1776. Authored primarily by Thomas Jefferson, it articulated the colonies' grievances against King George III and asserted their inherent rights to life, liberty, and the pursuit of happiness. This declaration not only facilitated the establishment of a new nation but also provided a framework for democratic ideals that would influence future revolutions and movements for independence globally. It remains a foundational text in American history.