Section: American History: Recent & Other
101. Why did the United States enter World War I?
Official answer
- • Because Germany attacked U.S. (civilian) ships
- • To support the Allied Powers (England, France, Italy, and Russia)
- • To oppose the Central Powers (Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria)
Why
The U.S. entered WWI after German attacks on its ships, joining the Allied Powers.
Answers verified against USCIS materials. Last checked 2026-07-17.
Official source: USCIS — 128 Civics Questions and Answers (2025)