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alternatehistory.com
Before WWII, there was a strong European Jewish working class. There used to be plenty of Jewish labor unions (see Bundism, for example) and Socialist/Communist Jewish organizations all across Europe and even the United States. Even Marx himself was Jewish, and so were others like Trotsky or Zinoviev.
So, the challenge is, with a POD after January 1, 1900, make most European nations -and other non-European ones, like the United States or Argentina- have an important Jewish working class and a strong Jewish involvement in Socialist politics by 2010.
(And please, make your answers more elaborated than "No Holocaust")