This map shows how the United States expanded from a small group of 13 British colonies into one of the largest powers on Earth. Every color marks land America gained through purchases, wars, treaties, and strategic deals. In 1783, the U.S. began with the original thirteen states after Britain recognized their independence. In 1803, the Louisiana Purchase doubled the nation overnight. Texas joined in 1845 as an independent republic, and Mexico surrendered massive territories in 1848. The U.S. ke