Not quite a timeline but one of the ARC Riders series (well two books) had time travellers from the 23rd Century USA (the USA having then diminished to a backward, second-rate country with no global influence) try and "fix" history by tampering with US involvement in Vietnam in 1968. They use mind control to engineer a coup d'etat in the US and have a group of US launch a ground invasion of North Vietnam in 1969. Then of course things Go Horribly Wrong, culminating in large scale use of tactical nuclear weapons and WW3.
There was some coverage of events in the rest of the world and more in the police-state USA.