"The successful termination of the war against our present enemies will find a world profoundly changed in respect of relative national military strengths, a change more comparable indeed with that occasioned by the fall of Rome than with any other change occurring during the succeeding fifteen hundred years. . . After the defeat of Japan, the United States and the Soviet Union will be the only military powers of the first magnitude. This is due in each case to a combination of geographical position and extent, and vast munitioning potential."-Source: U.S. military staff to the Secretary of State, 1944The excerpt best serves as evidence of which of the following trends during the 1940s?

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