How doesn't really matter. JFK doesn't go to Dallas, but VP Johnson goes for some reason, in '63 or '64, and gets plucked by Lee Harvey Oswald. Johnson was from Texas after all, so it isn't a stretch. JFK is alive by the end of his mandate, but his VP has been murdered by a communist. What's next for '60s America?
(Yes. Assume Oswald did it all alone. Don't say "the people really behind JFK's assassination do it on schedule.")
(Yes. Assume Oswald did it all alone. Don't say "the people really behind JFK's assassination do it on schedule.")