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The United States of America is a vast country in North America. It borders on Canada to the north and Mexico to the south, and has a land area of about 9.6 million km² (about half the size of Russia and about the same size as China). It also has the world's third-largest population, with more than 320 million people. It includes densely populated cities with sprawling suburbs and vast uninhabited areas of natural beauty. Representing the world's single largest economy with its history of mass immigration dating from the 17th century, it is a "melting pot" of cultures from around the world.\nRegarded as the most powerful and influential country in the world, it plays a dominant role in the world's cultural landscape, and 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 canyonlands of the Southwest, to the warm, sunny beaches of Florida, Hawaii and Southern California.