The US expanded its presence in South Vietnam because:

Question

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A) The US did hope for covert operations into Laotian politics, as evidenced by the US involvement in the Laotian Civil War that occurred alongside the Vietnam War.
B) The US feared losing credibility among its allies if it did not support South Vietnam, as demonstrated by US leaders' belief in the domino theory and a potential spread of communism throughout Southeast Asia.
C) The US did not want to risk Chinese intervention by invading North Vietnam, as China had previously intervened in the Korean War to support North Korea against US-backed South Korea. Therefore, expanding its presence in South Vietnam was seen as a way to contain the spread of communism while avoiding the risk of direct confrontation with China.

The US Expanded Its Presence in South Vietnam Because