The United States of America is a large country in North America, often referred to as the ""USA"", the ""US"", the ""United States"", ""America"", or simply ""the States"". It has the world's third largest population, with over 310 million people. It includes both densely populated cities with sprawling suburbs, and vast, uninhabited and naturally beautiful areas.
With its history of mass immigration dating from the 17th century, it is a ""melting pot"" of cultures from around the world and plays a dominant role in the world's cultural landscape. It is famous for its wide array of popular tourist destinations, ranging from the skyscrapers of Manhattan and Chicago, to the natural wonders of Yellowstone and Alaska, to the warm, sunny beaches of Florida, Hawaii and Southern California.