How did Ngo Dinh Diem’s treatment of Buddhists affect South Vietnam?

Ngo Dinh Diem’s treatment of the Buddhist majority in South Vietnam significantly destabilized his regime and deepened the country's internal divisions. As a Roman Catholic, Diem showed clear favoritism toward fellow Catholics, which alienated the Buddhist population and rendered his government increasingly unpopular.12

Tensions reached a breaking point in 1963 following a series of discriminatory actions and violent crackdowns on Buddhist protests, including a fatal incident at a rally celebrating the Buddha’s birthday. In response to this repression, Buddhist monks and a nun famously staged acts of self-immolation, which drew international attention and intensified domestic unrest.134

These events eroded the legitimacy of Diem’s leadership and caused his support among the South Vietnamese populace and the professional classes to collapse. Ultimately, the regime's inability to manage these religious tensions, combined with its heavy-handed military tactics against the Viet Cong, led the United States to withdraw its support, culminating in a coup d’état by South Vietnamese generals in November 1963 that resulted in Diem’s death.3512