Why was the united states concerned about vietnam during the 1950s? the united states feared communism would spread to laos and cambodia. the united states wanted to vietnam gain independence from france. the united states did not want france to take control of vietnam from the ussr. the united states thought it would have to send troops to dien bien phu.

The United States feared Communism would spread to Laos and Cambodia.

American interest in Vietnam increased during the 1950s when the North Vietnamese army (supported by the Soviet Union, China, and other communist allies) threatened to take over Vietnam. The U.S. feared that communism would spread to its neighboring countries such as Laos, Cambodia, Thailand, Burma, Malaya, and Indonesia, which could result in one-quarter of the globe (from East Germany to the shores of the Pacific Ocean) becoming communists too.

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the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.