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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.
Historical worth. Depending on how it is calculated, a million US dollars in 1900 is equivalent to ($28.8 million in 2016). Thus one would need to have almost thirty million dollars today to have the purchasing power of a US millionaire in 1900, or more than a hundred million dollars to have the same impact on the US economy.