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Question 100 of 128 American History

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

Answers USCIS accepts

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

Give any one of these answers at your interview.

Wars fought by the United States in the 1900s include World War I, World War II, the Korean War, the Vietnam War and the Persian Gulf War.

What it means

The United States fought in both world wars, then in Korea (1950–1953) and Vietnam during the Cold War, and in the Persian Gulf War in 1991.

Any one is enough. “World War II” is easy to remember.

Memory tip: 1900s: World War I and World War II.

Quiz yourself

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

Multiple choice is for study only. The real civics test is spoken: the officer asks, you answer out loud.

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Official source: USCIS M-1778 (09/25), 128 Civics Questions and Answers (2025 version). Last checked: .