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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.
On the long scale, there are 18 zeros in a trillion (1018). It is 1,000,000,000,000,000,000. In the US, there are 12, excluding the 2 zeroes past the decimal. (see below) <br /><br /> $1,000 is one thousand US dollars. <br /> $1,000,000 is one million US dollars. <br /> $1,000,000,000 is one billion US dollars. <br /> $1,000,000,000,000 is one trillion US dollars.