Question 110 of 128

Why did the United States enter the Korean War?

Official USCIS answers

To stop the spread of communism

Why this is the answer

In 1950, communist North Korea invaded South Korea. The United States led a United Nations force to defend South Korea. The goal was containment: stopping communism from spreading to more countries.

💡 Memory tip: Remember 'containment': stop communism from spreading.

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More from Recent American History and Other Important Historical Information

100. Name one war fought by the United States in the 1900s.
101. Why did the United States enter World War I?
102. When did all women get the right to vote?
103. What was the Great Depression?
104. When did the Great Depression start?
105. Who was president during the Great Depression and World War II?

Source: USCIS, 128 Civics Questions and Answers (2025 version), M-1778.