What group posed the biggest threat to the south vietnamese government?

n November 1963, President Ngô Đình Diệm of South Vietnam was deposed by a group of Army of the Republic of Vietnam officers who disagreed with his handling of both the Buddhist crisis and the Viet Cong threat to the regime.

The Kennedy administration had been aware of the coup planning,[3] but Cable 243 from the United States Department of State to US Ambassador to South Vietnam Henry Cabot Lodge, Jr., stated that it was US policy[4] not to try to stop it. Lucien Conein, the Central Intelligence Agency’s liaison between the US embassy and the coup planners, told them that the US would not intervene to stop it. Conein also provided funds to the coup leaders.[5]

The coup was led by General Dương Văn Minh and started on 1 November. It proceeded smoothly as many loyalist leaders were captured after being caught off-guard and casualties were light. Diệm was captured and executed the next day along 

they made rome the dominant power in the mediterranean.

yes they have. but is this a true false question? if it is, the answer is true.