United States imposed trade sanctions, then embargo, trying to slow Japan's military aggression
Admiral Yamamoto communicates with Japanese officers about Pearl Harbor attack.
Admiral Husband E. Kimmel is takes over command of U. S. Pacific Fleet in Hawaii.
United States intelligence officers monitor Japanese secret communications.
Japanese Admiral Nomura informs his superiors that U. S. has been reading messages. Noone believed the code could be broken and was not changed.
Admiral Yamamoto trains military and plans for Pearl Harbor attack.
Bomb plot message from Japanese naval intellifence to Japan's consul in Honolulu requested locations of U. S. ships in Pearl Harbor.
Diplomat from Tokyo comes to Washington to seek a diplomatic solution. Japan wants the U.S. to agree to its Southern expansion in Asia. U. S. did not agree and Japan wa prepared for a war.
War Warning received from Washington informing of a Japanese attack with a possible American target in the Pacific.
U. S. Intelligence decodes a meassage stating Sunday morning as a deadline for a Japanese attack. The message was received in Washington bur not forwarded to Pearl Harbor. The message arrived after the attack has started.
The first Japanese aircraft started attacking Pearl Harbor. Airfields and ships are attacked. The attack continued for 2 hours and 20 minutes. When over, more than 2,400 Americans died and 1,200 wounded. Eighteen ships were sunk or dmanged and over 300 aircraft were destroyed or damaged.
President Roosevelt asked Congress for a declaration of war on Japan, which he received.
Admiral Kimmel and General Short are relieved of their commands.