Which of the following identifies an important reason for the European exploration of North America?
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The Civil War<span> was the first </span>war<span> in which </span>railroads were<span> a major factor. The 1850s had seen enormous growth in the </span>railroad industry<span> so that by 1861, 22,000 miles of track had been laid in the Northern states and 9,500 miles in the South.</span>
