Which factor was greatest advantage of the United States in world war two

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The fact that their homeland was far beyond the realm of European or Japanese invasion or bombing (with the exception of pearl harbour). This way their arms factories could operate without being bombed unlike Germany and Britain. The soviets had a similar advantage as they located their arms factories behind the Ural mountains in Siberia, far from any German bomber's range.   Hope I helped and please rate my answer :) 

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