Winston S. Churchill said this quote

Now at this very moment I knew that the United States was in the war, up to the neck and in to the death. So we had won after all! ... How long the war would last or in what fashion it would end no man could tell, nor did I at this moment care ... We should not be wiped out. Our history would not come to an end ... Hitler's fate was sealed. Mussolini's fate was sealed. As for the Japanese, they would be ground to a powder. All the rest was merely the proper application of overwhelming force.