(1775-83) War that won political independence for 13 of Britain's North American colonies, which formed the United States of America. After the end of the costly French and Indian War (1763), Britain imposed new taxes (See: Stamp Act; Sugar Act) and trade restrictions on the colonies, fueling growing resentment and strengthening the colonists' objection to their lack of representation in the British Parliament. Determined to achieve independence, the colonies formed the Continental Army, composed chiefly of minutemen, to challenge Britain's large, organized militia.