This vietnamese leader was elected president in 1967 and in the process restored order to the government. ngo dinh diem bao dai ho chi minh nguyen van thieu
secretary of defense was one of the architects of the vietnam war.

The correct answer is:Nguyen Van Thieu

Nguyen Van Thieu was elected on September 3, 1967. He succeeded in his campaign for the new South Vietnamese presidency and held that position until a few days before the Fall of Saigon in 1975.  

Thieu created a political party and centralized most of the political power in the executive branch cosra of the elected Congress. Allies close to him were placed in key ministerial and military posts to prevent the emergence of any threat to the president