|Hitler and Mussolini declare war on US| December 11th 1941; Germany and Italy have announced they are at war with the United States. America immediately responded by declaring war on the two Axis powers. Three days before, US President Franklin Roosevelt announced America was at war with Japan, the third Axis power, following the surprise attack on its naval base at Pearl Harbor. Italian dictator, Benito Mussolini, made his declaration first - from the balcony over the Piazza Venezia in Rome - pledging the "powers of the pact of steel" were determined to win. Then Adolf Hitler made his announcement...