The United States declared independence in 1776. Specifically, the Declaration of Independence was adopted on July 4, 1776, marking the formal assertion of independence from British rule. This pivotal document, primarily authored by Thomas Jefferson, articulated the colonies' grievances against King George III and outlined the philosophical basis for a new nation based on principles of liberty, equality, and government by consent. The declaration is now celebrated annually on July 4th, known as Independence Day, and has become a symbol of freedom and democracy not only for the United States but also for other nations aspiring to independence.