Question 111
A growing nation
Why did the United States enter the Vietnam War?
The United States fought in the Vietnam War (1955-1975) to stop the spread of communism from North Vietnam to South Vietnam. During the Cold War, America followed the “domino theory” – leaders believed that if one country became communist, neighboring countries would follow.
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Section "Learn and Explore" uses official instructions and media files of US Citizenship and Immigration Services, US National Museum of American History, The Smithsonian Institution and other governmental and public organization.