Answer
In a U.S.-backed coup, the Ngô Đình Diệm government was overthrown. Diệm's autocratic rule, suppression of the Buddhist majority, and ineffective land reforms sparked discontent among the population and military. The United States, concerned about Diệm's policies and the growing communist influence in South Vietnam, withdrew its support, leading to a successful coup on November 1, 1963, which resulted in Diệm's assassination.