A few of those entries needed names...

Tojo, Chiang Kai-Shek, Mao, and Truman were all considered "major" players at the time (we can forgive the absence of Atlee), but not listed.

The USA really blossomed as a result of the war, as the 1950s showed, and Russia became a superpower (hollow, but no one knew/believed that), but I think a good argument could be made for either Sweden or Switzerland, who smugly played off both sides against one another and came out of the war with roaring economies themselves -- without significant casualties. Some brains involved there.

Seamus