Question 100 of 128
Name one war fought by the United States in the 1900s.
Official USCIS answers
- World War I
- World War II
- Korean War
- Vietnam War
- (Persian) Gulf War
Why this is the answer
The Korean War was fought from 1950 to 1953, which is in the 1900s. The United States fought as part of a United Nations force to help South Korea. So it is one correct official answer.
💡 Memory tip: Remember: two World Wars plus Korea, Vietnam, and the Gulf War — all in the 1900s.
Could you say it out loud to an officer?
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Source: USCIS, 128 Civics Questions and Answers (2025 version), M-1778.