1. No Bay of Pigs- Nixon would have been too savvy to 'sort of' give an indication that US planes would provide air cover.
I still disagree with this. Bay of Pigs was an Eisenhower administration plan, and one which Nixon was supportive of (as I've said, Kennedy tried to hoist Nixon by his own petard by playing Devil's advocate during the debates leading Nixon to play Devil's advocate and whoop him). It could have air cover, but that makes it all the more dangerous. It was supposed to be covert so the US wouldn't get caught and air cover was something that could have blown the cover. It was also supposed to rely on the exiles, who were to join with rebel forces in Cuba and rile up the population against Castro and take the country. I doubt even with air cover that the exiles could have done any better. All that would have happened is that Bay of Pigs would have been bloodier, in my opinion. Not prevented and not successful.
2. No humiliation by Khruschev at Vienna in the spring of 1961. Nixon had a better understanding of Khruschev's bullying rhetoric.
I suppose I agree.
I can see the reasoning to this, but the factors that lead to the wall seem in motion. Berlin was already divided, travel between east and west were becoming increasingly constricted, and the Eastern Germans were losing people and feared a "Brain Drain".
4. Cuban Missle Crisis- Maybe, but Nixon would have reacted much the same as JFK did.
Agreed that Nixon would be looking at the options Kennedy would in the way Kennedy would, roughly.
5. Viet Nam- I can't see Nixon falling in to the trap of committing US ground forces. Hard to tell, because the US never understood the conflict.
Nixon would have followed the path of advisers and aid and supply most likely. I don't think there's any reason that means Nixon never, ever, ever could have committed troops, but I don't see it as likely.
6. There would have been a Civil Rights Act and a Voting Rights Act, probably in Nixon's second term. Would have required some interesting Liberal Republican and Liberal Democrat alliances.
This isn't meant to be a complete list- just some thoughts.
Nixon could have sold it as anti-Communist legislation emboldening US strength in numbers, and if nothing else the Liberals of both parties could generate it in the Congress.