No American will think it wrong of me if I proclaim that to have the United States at our side was to me the greatest joy. I could not foretell the course of events. I do not pretend to have measured accurately the martial might of Japan, but now at this very moment I knew the United States was in the war, up to the neck and in to the death. So we had won after all! … Hitler's fate was sealed. Mussolini's fate was sealed. As for the Japanese, they would be ground to powder.

The Second World War, Volume III : The Grand Alliance (1950) Chapter 32 (Pearl Harbor).