What event is credited with fundamentally transforming how Americans saw their position in the world, bringing an end to the idea of "Fortress America"?

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The Japanese attack on Pearl Harbor on December 7, 1941, is credited with fundamentally transforming how Americans saw their position in the world. It marked a clear end to the isolationist sentiment that had dominated much of American foreign policy, illustrating that the United States was not impervious to foreign attack and leading directly to its entry into World War II.

What Event Is Credited with Fundamentally Transforming How Americans Saw