In Philadelphia, Pennsylvania, the Continental Congress adopts the Declaration of Independence, which proclaims the independence of the United States of America from Great Britain and its king. The declaration came 442 days after the first volleys of the American Revolution were fired at Lexington and Concord in Massachusetts and marked an ideological expansion of the conflict that would eventually encourage France’s intervention on behalf of the Patriots.
With the other colonies watching intently, Massachusetts led the resistance to the British, forming a shadow revolutionary government and establishing militias to resist the increasing British military presence across the colony. In April 1775, Thomas Gage, the British governor of Massachusetts, ordered British troops to march to Concord, Massachusetts, where a Patriot arsenal was known to be located. On April 19, 1775, the British regulars encountered a group of American militiamen at Lexington, and the first shots of the American Revolution were fired.