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"Given the extraordinarily favorable economic and strategical position which the United States thus occupied, its post-1945 outward thrust could come as no surprise to those familiar with the history of international politics. With the traditional Great Powers fading away, it steadily moved into the vacuum which their going created; having become number one, it could no longer contain itself within its own shores, or even its own hemisphere. To be sure, the war itself had been the primary cause of this projection outward of American power and influence. . ."-Source: Paul Kennedy, historian, The Rise and Fall of the Great Powers: Economic Change and Military Conflict from 1500 to 2000, 1987Which of the following could best be used as evidence to support the argument in the excerpt that the United States "could no longer contain itself within its own shores" of the period?

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