For instance, regarding Nam, Eisenhower set up the phony state, plucking a Jesuit, Diem, then living in the USA, and placing him in Saigon as the president.
According to history, South Vietnam was established by an act of the Geneva Conference on Indochina.
That conference was attended by reps from U.S., Britain, China, the Soviet Union, France, Vietnam (Viet Minh and representatives of Bao Dai), Cambodia and Laos.
South Vietnam was established officially on July 21, 1954 - The Geneva Accords divide Vietnam in half at the 17th parallel, with Ho Chi Minh's Communists ceded the North, while Bao Dai's regime is granted the South.
Yes, the US did oppose elections regarding reunification, but for you to claim that the US created South Vietnam or that Diem was appointed as its president by Eisenhower in just plain wrong.
October 1954 In the South, Bao Dai has installed Ngo Dinh Diem as his prime minister. The U.S. now pins its hopes on anti-Communist Diem for a democratic South Vietnam. It is Diem, however, who predicts "another more deadly war" will erupt over the future of Vietnam.