If Eisenhower doesn't run in 1952, for whatever reason, and Taft wins the election, it's going to spook a lot of European countries. According to his wikipedia page, he was opposed to NATO and thought the Korean War was unconstitutional. Even if he dies in his first year in office and his vice-president is Richard Nixon, the mere fact that the American public would elect him while the Korean War is still going on would lead Europe to reevaluate their dependence on the United States for defense. And, in the 50s, that means nukes.
What do you think? Which countries would pursue programs, and how long would it take to develop them? I'm thinking France and Italy immediately, and maybe the Benelux countries in a joint program. West Germany might or might not want them, but they're not going to get them. I'm not sure about Spain and Portugal, but I'm thinking probably not in the 50s; they might pursue them later. Possibly Turkey - I'm sure they'd want them, but I don't know if they could get them in the 50s.
The French nuclear project took five years IOTL (1956-1960). ITTL, I'm thinking six years for France, 1953-1958, and eight years for Italy, 1953-1960.
Thoughts?