I believe B.<span>The U.S. lent military supplies in exchange for bases.</span>
U.S. foreign policy shifted away from "isolationism" to international involvement, since the US started to steer away from Washington's idea that it should remain as detached from foreign issues as possible.
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Eventually, railways lowered the cost of transporting many kinds of goods across great distances. These advances in transport helped drive settlement in the western regions of North America. They were also essential to the nation's industrialization. The resulting growth in productivity was astonishing
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Answer: C(territorial expansion of the United States.
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