The reason that the United States shifted from an advisory role to actual military involvement in the North and South Vietnam conflict was the political instability and military losses suffered by South Vietnam.
Some historians have traced the Vietnam War to the following issues:
Based on America's containment foreign policy, the United States continued to support South Vietnam with military advisory.
Thus, the reason that the United States shifted from an advisory role to actual military involvement in the North and South Vietnam conflict was the political instability and military losses suffered by South Vietnam.
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