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The correct answer is B: Immigration was based on the national origins quota system. The National Origins Act was a United States federal law that set the amount of immigrants from certain countries that were allowed to enter the U.S. Admission to the U.S was determined by ethnic identity and national origin. It reduced the number of southern and eastern Europeans and excluded Asians entering the country.
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The topography of an area was important for early human settlement. Farmers preferred to settle in flat, open areas such as plains and valleys. Large, flat spaces gave farmers room to plant crops. Also, the rich soil in coastal plains and river valleys was excellent for growing these crops.
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