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Why did the United States enter the Vietnam War?

Answer
To stop the spread of communism
Remember it: Korea and Vietnam: same answer.
En español
¿Por qué entró Estados Unidos en la Guerra de Vietnam?
  • Para detener la expansión del comunismo

El examen se hace en inglés. Más en la página en español.

Source: U.S. Citizenship and Immigration Services, 2025 civics test. Last reviewed September 5, 2026. Report a problem with this question.

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This is question 111 of 128 on the 2025 USCIS civics test, in the section Recent history.

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From World War I to September 11, 2001: why the United States entered each war, the Great Depression, the Cold War, the civil rights movement, and American Indian tribes and innovations. This is the second-largest section, so a few of these will almost certainly come up.

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Recent history: read aloud, answered out loud, repeated until solid.

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