Sordel on 25 January 2019
Consider some plausible consequences: no Hitler, no WW2, no nuclear weapons (or space travel), weak Germany, no checks to the westward expansion of the U.S.S.R. through Europe, no State of Israel, no checks to the expansion of U.S.S.R. influence through the Middle East, decline of U.S. power following the oil shock. And Stalinist Russia was no friend to its Jewish population so there's a possibility of genocide there as well.
