Respuesta :
The reason why United States concerned about Vietnam during the 1950s is that The United States feared that communism would spread to Laos and Cambodia
What is Vietnam during the 1950s all about?
In 1950 with the help of Soviet Union the Viet Minh revived offensive act against French outposts in Vietnam.
However, United States concerned about this because,United States feared that communism would spread to Laos.
Learn more about Vietnam at;
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