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The darker areas on the map above had high populations of settlers by 1870. In the years that followed, the lighter-colored areas
began to attract more settlers as well. This movement west happened because
OA. there were no factory jobs left in the East Coast cities.
OB. gold had been discovered in Midwest land.
OC. the East Coast was still ruled by the British.
OD. more land was needed for the growing population.