Section: American History: Recent & Other
106. Why did the United States enter World War II?
Official answer
- • (Bombing of) Pearl Harbor
- • Japanese attacked Pearl Harbor
- • To support the Allied Powers (England, France, and Russia)
- • To oppose the Axis Powers (Germany, Italy, and Japan)
Why
The U.S. entered WWII after Japan's attack on Pearl Harbor in 1941.
Answers verified against USCIS materials. Last checked 2026-07-17.
Official source: USCIS — 128 Civics Questions and Answers (2025)