The American Revolution began in 1775 as tensions increased between the 13 colonies and Britain over taxation and lack of representation. Major figures like Thomas Jefferson and George Washington played important roles as the colonies fought for independence. Key events escalated the conflict, including the Boston Tea Party in 1773 and the battles of Lexington and Concord in 1775, leading France to ally with the colonies in 1778. The colonies ultimately won independence in 1783 after the American victory at Yorktown.