America, led by Franklin D. Roosevelt, placed an embargo on all aviation fuel, steel, scrap iron, and other raw materials to Japan. Then, a crucial event took place on August 17th, 1940; Lieutenant-Colonel Friedman (an American Cryptographer) breaks the secret "Japanese Purple Code (MAGIC)" (Essential Pearl Harbor). America could now decipher some secret messages being sent to and from Japan.
The Japanese government saw these acts on behalf of America, an Arsenal of Democracy, as a threat to Japan remaining an independent and surviving nation. Because their country lacks natural resources and had an embargo placed on them, the Japanese government decided to overpower and occupy the areas in Southeast Asia that had lots of resources (Infamy). Top Japanese officials felt that war with the United States was inevitable, but with a large American fleet in the Pacific stationed at Pearl Harbor on the island of Oahu, war was going to be difficult if Japan was on the defensive. It would have been to Japan's advantage if they were the ones to pick the time and place of battle, as they went on to do. Admiral Isoroku Yamamoto came up with the idea of annihilating the entire American pac