The United States of America ( also "USA," "US," "United States," "America," or simply "the States") is a large country in central and north-western North America, with its capital in the city of Washington DC. One of the most powerful and wealthy nations on earth and third largest in territory and people, The United States has a mixture of densely-populated urban areas with wide areas of low population, incredible natural beauty, a well-developed infrastructure and high productivity. Its healt...