America's general bent toward isolationism and attitudes about the War in Europe changed dramatically with

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The Japanese attack on Pearl Harbor on December 7, 1941, led to a rapid and dramatic shift in American attitudes towards the war in Europe. Prior to the attack, the United States had maintained a policy of neutrality and isolationism, but the attack spurred the U.S. to declare war on Japan and, by extension, Germany, and join the Allied forces in their fight against the Axis powers. The attack on Pearl Harbor was widely seen as a direct threat to American security and convinced many Americans that the U.S. needed to take an active role in the war effort.

America's General Bent Toward Isolationism and Attitudes About the War