Does JFK’s assassination butterfly effect coming decades

[Sir Mohamed]

Doubtful, if you ask me. I don't believe JFK would have completely withdrawn from Vietnam, though he may have changed course sooner and avoided having 550,000 troops on the ground which was a grave mistake. On domestic policy, he would have been far less successful than Johnson, who benefited from his political skills and the momentum after the tragic assassination. A weaker civil rights bill would have been passed in 1965 and probably no Medicare. No way civil rights law gets enacted in 1964. Kennedy might not even have tried in an election year.

There is no question Kennedy would have won a second term in 1964 by a sweeping margins (but nowhere near Johnson's 61% PV / 486 EVs landslide). 1968 would have been a pure tossup. I don't see why Nixon should not have been a serious candidate assuming he didn't challenge JFK in 1964. I'm skeptical Rockefeller or Reagan would have been nominated, because they faced much opposition at the time within the GOP. So if Nixon still becomes prez in 1969, Watergate would have happend regardless of JFK living.

Btw, I'm not even sure Kennedy would have survived a second term. He was chronically ill and might have been dead by 1967 or so.