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Greatest turning point of WW2

LAURENCE REES: What was the single greatest turning point of the war?

MARY FULBROOK: Well you can find all sorts of telling points can’t you? I mean there are several very obvious candidates. One is the invasion of the Soviet Union, one is the declaration of war on the USA.

LAURENCE REES: But you can only pick one?

MARY FULBROOK: The declaration of the war on the USA. But I could say the invasion of the Soviet Union.