Posted by Jacklyn on Tuesday, November 11, 2008 at 10:48pm.
North Vietnam was allied with China, a communist nation. We were afraid that if North Vietnam took over South Vietnam that the entire country would become communist and that other countries would also fall to communism. It was called the domino effect.
Check this site for more details.
http://encarta.msn.com/encyclopedia_761552642/Vietnam_War.html
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