Welcome to the Land of the Free, Home of the Brave. Discover a land of stunning geographical contrast, from sea to shining sea. Visit the capital and home of U.S. government, Washington D.C., then travel north to the first capital, Philadelphia, where the constitution was signed. Find out why America has the most diverse population on Earth. Meet the upholsterer Betsy Ross, who stitched the first Stars and Stripes.National Geographic supports K-12...