Final answer:
The US initially supported President Ngo Dinh Diem due to his anti-communist position, but withdrew support as his government became more autocratic and faced internal unrest, leading to his assassination.
Explanation:
President Ngo Dinh Diem was initially supported by the US due to his anti-communist stance and as a leader who opposed the spread of communism in Vietnam. However, as Diem's government grew increasingly autocratic, he faced internal unrest, preventing elections for reunification, and ruling with military force with US economic support. This led to the US shifting its support away from Diem, especially after a series of raids against Buddhist monasteries in 1963, ultimately resulting in his assassination.
Learn more about US support for President Ngo Dinh Diem and its later change here:
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