The United States Declaration of Independence, formally The unanimous Declaration of the thirteen united States of America, is the pronouncement and founding document adopted by the Second Continental Congress meeting at Pennsylvania State House (later renamed Independence Hall) in Philadelphia, Pennsylvania, on July 4, 1776. Enacted during the American Revolution, the Declaration explains why the Thirteen Colonies at war with the Kingdom of Great Britain regarded themselves as thirteen independent sovereign states, no longer subject to British colonial rule. With the Declaration, these new states took a collective first step in forming the United States of America and, de facto, formalized the American Revolutionary War, which had been ongoing since April 1775.