American History — Recent American History · Question 90 of 128
Name ONE war fought by the United States in the 1900s.
Practice answer: World War II
Why this is the answer
World War II was one war the United States fought in the 1900s. Other examples include World War I, the Korean War, the Vietnam War, and the Gulf War.
On the 2026 citizenship test, a USCIS officer asks up to 20 questions from the official 128-question pool — answering 12 correctly passes.
Study translations and question index
Practice index: 90. This is not the official 2025 syllabus question number. Translation indices share the same practice ID and answer-option order.
Español — practice:90:es
Mencione UNA guerra en la que luchó Estados Unidos en el siglo XX.
La Segunda Guerra Mundial
العربية — practice:90:ar
اذكر حربًا واحدة خاضتها الولايات المتحدة في القرن العشرين.
الحرب العالمية الثانية
Official syllabus and legal sources
M-1778 (09/25) — 2025 USCIS syllabus. Retrieved 2026-10-15. Check current USCIS answers.
- 8 U.S.C. § 1423 — English, history and civics requirements
- 8 C.F.R. § 312.2 — Knowledge of history and government
These laws establish testing requirements; they are not individual legal advice or a citation for every historical answer. Practice questions and study translations are editorial learning aids, not official USCIS translations. Confirm the test version that applies to your filing date.
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