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Most important turning point of WW2

LAURENCE REES: What do you see as the single most important turning point of the war?

GEOFFREY WAWRO: There are two. There’s the German decision to invade the Soviet Union and there’s the Japanese decision to attack the United States at Pearl Harbour. It depends whether you look at the Japanese war effort or the German war effort. For the German’s it is Barbarossa and for the Japanese it is the fateful decision to attack the US Pacific Fleet at Pearl Harbour.