From Kevin "The U.S. saved Europe from sheer totalitarian rule".

Because that was the end result.

I disagree with you slightly here <s>. If it had not been for the work done by Churchill and his gang in the Cabinet War Rooms, it might have been too late by the time America got involved in the war. Great Britain stood up against Hitler long enough so that we could get there in time with the additional fire power required to defeat him.