Answer
Ngô Đình Diệm, a South Vietnamese general and later president, ousted Bảo Đại in 1955. Diệm had been serving as prime minister since 1954, and he had been at odds with Bảo Đại for some time. Diệm wanted to implement a more authoritarian style of government, while Bảo Đại wanted to maintain a more democratic system.