The American Revolution (1775–1783) was a colonial revolt that took place in British America. The American Patriots in the Thirteen Colonies fought for independence from Great Britain. The war started in 1775 when the Americans defeated the British at the Battles of Lexington and Concord. However, the American Colonies were ill-prepared to wage a war against the world's leading naval and imperial power. The outcome was in doubt even after France entered the war in 1778 as an American ally, bringing badly-needed money and military support.
Although the French initially provided vital support for the Americans, it was the French navy under the command of Admiral De Grasse that played a decisive role in the war by blockading the Chesapeake and assisting in the final battle of the Revolutionary War, the Battle of Yorktown, in 1781. France's participation contributed significantly to the final outcome, with France receiving some of the North American territory claimed by Spain in return.