I think Germany had no choice but to attack the Soviets as it was evident by the Soviet aggressive wars in Finland,Manchuria and the Baltic that they would infact attack Germany very soon. If the Germans would not have wasted resources, manpower, and Brainpower fighting the "Jewish" treat they might have pulled out a victory. In any case Nazi Germany did many positive things of rebuilding the nation, but the henious quest which of exterminating the Jews along with their treatment of conquered Slavs brought the envitable demise of Nazi Germany.

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