A late 20th century Vietnam timeline created by La Rouge Beret. You can read it here.

Dr. Phan is chosen as Prime Minister for South Vietnam rather than Mr. Diem. A slew of butterflies ensure to maintain a surviving South Vietnamese state.

So far, the timeline has had two different versions:

a.) The original version, now abandoned. It can be read here.

b.) The current, Redux version, which you can read here. This version includes the creation of a stronger non-communist political structure within Southern Vietnam.