The initial cause of America's involvement in Vietnam was America's fear of ____ effect that would occur with the loss of South Vietnam to the north.

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The fear of the domino effect, where if one country fell to communism, others would follow, was the primary reason for America's involvement in Vietnam. The US government believed that if South Vietnam fell to the communist North, it would lead to the spread of communism throughout Southeast Asia, and America's credibility as a world power would be at stake.

The Initial Cause of America's Involvement in Vietnam Was America's