The United States remained neutral in the war despite Japanese and German aggression. On December 7, 1941, Japan without warning attacked the United States naval base at Pearl Harbor, Hawaii. President Roosevelt called this "a day that will live in infamy," and the United States declared war on Japan. The Japanese, Germany's ally, did not tell Hitler of their plans to attack the United States nor did they have a long-range strategy to defeat their new enemy. Three days later, Germany and Italy declared war on the United States. Almost overnight, it seemed, the United States moved from an officially neutral observer to a key participant on two fronts of world-wide war. By attacking the United States, Japan brought the world's greatest industrial complex, a skilled and resolved labor force, and the largest supply of strategic raw materials into the war on the side of the Allies. The war turned into global conflict involving every major power in the world.