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At 3.8 million square miles (9.8 million km2) and with over 324 million people, the United States is the world's third-largest country by total area (and fourth-largest by land area) and the third-most populous.
USA â GDP $16.2 trillion. The United States has been the world's largest economy for at least a century. One third of the world's millionaires and 40% of the worlds billionaires live in the United States, making it the wealthiest nation in the world.