Until the twentieth century and World War II at least, American national security was mostly based on:

Name: Until the twentieth century and World War II at least, American national security was mostly based on:
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The geographic isolation of the United States, with oceans on both its east and west coasts, provided a natural barrier against foreign invasions, contributing significantly to its national security before the twentieth century and World War II.

Until the Twentieth Century and World War II at Least