Independence Day, or the Fourth of July, celebrates the adoption by the Continental Congress of the Declaration of Independence on July 4, 1776. On the 236th birthday of the United States, explore nine surprising facts about one of America’s most important founding documents. 1. The Declaration of Independence wasn’t signed on July 4, 1776. On July 1, 1776, the Second Continental Congress met in Philadelphia, and on the following day 12 of the 13 colonies voted in favor of Richard Henry Lee’s motion for independence.