Could WWII been won without the US? Against the axis of Germany, Italy, and Japan... no way. Not to lessen the contribution of our allies... but there is no way that Great Britain could have liberated Europe, let alone N. Africa without the US... just look up Churchill's speeches and writings. In the Pacific... I am sure that Australia could have survived for awhile,maybe a few years; but without the US the Japanese empire would have run rabid throughout the Pacific rim. Sorry, but if anybody thinks that the outcome would have been positive in either hemisphere without the US is just full of shit.