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One of Hitler's assumptions going into Barbarossa was that the defeat of the USSR would have brought the British to the peace table. Assuming that everything goes wrong for Stalin and he is killed fleeing Moscow in October causing a major breakdown in C&C and the collapse of the Soviet government (handwavium), would it have meant Britain would have been more open to peace or would Pearl Harbor in December keeps them in and we get a Anglo-America Nazi war to the bitter end?