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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.
How many is a billion? The answer may seem obvious, but the use of this word can lead to confusion. In the UK and Ireland the word traditionally meant the number 1,000,000,000,000 (a million millions), which is called a trillion in the United States. A billion in the United States is considerably.