Which action by South Vietnamese president DIEM lost him US support?

Following the overthrow of his government by South Vietnamese military forces the day before, President Ngo Dinh Diem and his brother are captured and killed by a group of soldiers. The death of Diem caused celebration among many people in South Vietnam, but also lead to political chaos in the nation.

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the constitution of the united states gave congress the absolute authority over immigration laws

a they donate money to humanitarian causes

c   they volunteer to alleviate suffering

d   they blame all muslims for not being able to keep their fellow muslims in line.