The Second Continental Congress was the late-18th-century meeting of delegates from the Thirteen Colonies that united in support of the American Revolution and the Revolutionary War, which established American independence from the British Empire. The Congress constituted a new federation that it first named the United Colonies, and in 1776, renamed the United States of America. The Congress began convening in Philadelphia, on May 10, 1775, with representatives from 12 of the 13 colonies, after the Battles of Lexington and Concord.