Section: American History: Recent & Other

100. Name one war fought by the United States in the 1900s.

Official answer

  • • World War I
  • • World War II
  • • Korean War
  • • Vietnam War
  • • (Persian) Gulf War

Why

Wars in the 1900s included World War I and II, the Korean War, the Vietnam War, and the Gulf War.

Answers verified against USCIS materials. Last checked 2026-07-17.

Official source: USCIS — 128 Civics Questions and Answers (2025)