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Strictly speaking it didn't, but on 11th December 1941 - four days after Pearl Harbour - Germany declared war on the United States. The US and Britain then pooled their resources to fight Germany on the European mainland. Without the extra manpower and weaponry that the US brought into the war, it is unlikely that Britain could have defeated Germany on its own. Eventually, it needed the three most powerful nations on earth at the time to defeat the German war machine, US, UK and USSR.

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