Just something I've been interested in. Assuming a Roosevelt death before 1940 or him deciding to not run for a third (and fourth) term and a successor completely collapsing, how does World War Two look different under a Willkie, a Vandenberg, or a Dewey?
Abroad, does conservative Republican isolationism keep America out of conflict with Germany and Japan for longer, or do Republican business interests get America in the fight sooner? Does a Republican America gouge its allies as much as it did in OTL, or more, or less? Does the Soviet Union get any lend-lease aid?
At home, what changes in terms of how the war is fought? How does this effect post-war America, especially economically?