The Declaration of Independence was signed in Philadelphia, Pennsylvania, on July 4, 1776. The signing took place during the Second Continental Congress, where representatives from the thirteen American colonies came together to assert their independence from British rule. The document, primarily authored by Thomas Jefferson, outlined the colonies' grievances against King George III and articulated the principles of individual rights and government by consent. Philadelphia, as a central hub for revolutionary activity, was chosen for its historical significance, and the signing of the Declaration marked a pivotal moment in America's journey toward nationhood.