A few thoughts on this anniversary...
If JFK had lived:
1. He had started back-channel communications with Castro a few weeks before his death, so our relations with Cuba might have been very different.
2. He had also begun discussions with his advisors about an exit strategy from Vietnam. Some experts think he would have stayed in Vietnam; others, including some of his closest advisors, think he would have gotten out in a second term. It seems unlikely that he would have escalated as aggressively as LBJ.