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This is the TL in Norman Spinrad's The Iron Dream:
1919 - Adolf Hitler leaves Germany for New York City. He will become a successful SF writer in the United States.
1923 - The Nazi Party disappears.
1930 - Communist coup in Germany.
cca 1948 - The Greater Soviet Union occupies Britain.
cca 1949-1959 - 5 million Jews perish in the Greater Soviet Union.
1959 - Most of Africa is under Soviet influence, the South American republics are beginning to break up and Imperial Japan is an ally of the US.