The Boston Tea Party was an act of protest on December 16, 1773 during the American Revolution. Initiated by the Sons of Liberty in Boston, the capital of Massachusetts, one of the Thirteen Colonies of British America, it escalated hostilities between Great Britain and the Patriots, who opposed British policy towards its American colonies. Less than two years later, on April 19, 1775, the Battles of Lexington and Concord, also in Massachusetts, launched the eight-year American Revolutionary War, which resulted in the independence of the colonies as the United States.