"Just when I thought I was out, they pull me back in." What event led to the United States entering WWII in 1941?

“Yesterday, December 7, 1941—a date which will live in infamy—the United States of America was suddenly and deliberately attacked by naval and air forces of the Empire of Japan." The ''infamous day" referenced by U.S. President Franklin D. Roosevelt was the bombing of the U.S. naval base at Pearl Harbor. The surprise attack by Japanese forces killed 2,400 Americans and destroyed 300+ airplanes and almost twenty naval vessels, provoking America into entering WWII.

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