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2. Economy of the United States - Wikipedia

   en.wikipedia.org/wiki/Economy_of_the_United_States

   The U.S. economy is heavily dependent on road transport for moving people and goods. Personal transportation is dominated by automobiles, which operate on a network of four million miles (6.4 million km) of public roads, [340] including one of the world's longest highway systems at 57,000 miles (91,700 km). [341]