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President Roosevelt addresses Congress, making a declaration of war against Japan. He receives and the U.S. is now at War with Japan, officially entering the U.S. into World War II.

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In the morning on December, U.S. intelligence decodes a message pointing to Sunday morning as a deadline for some kind of Japanese action. The message is delivered to the Washington more than 4 hours before the attack on Pearl Harbor, but the message is not given to the Pearl Harbor commanders in time. The message arrives only after the attack has begun.

The first wave of Japanese aircrafts begin the attack. Along with U.S. ships in Pearl Harbor, the air stations at Hickam, Wheeler, Ford Island, Kaneohe and Ewa Field were also attacked.

The Japanese attack on Pearl Harbor continues for two hours. After the attack, more than 2,400 Americans are dead and about 1,200 wounded. Eighteen ships have been sunk or damaged, and more than 300 aircraft are damaged or destroyed.

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In a few weeks, submarines, the first units involved in the attack, depart Japan. A week after that, aircrafts travel to Hawaii. Kimmel and Short receive a warning from Washington indicating a Japanese attack on an American target in the Pacific.

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Two months later, Japan sends an experienced diplomat to Washington as a special envoy to assist Kichisaburo Nomura. They seek a diplomatic solution. Japan wants the U.S. to agree to its southern expansion in Asia diplomatically. If the U.S. didn't agree, Japan was prepared to go to war.

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In July and throughout the summer, Adm. Yamamoto trains his forces and finalizes the planning of the attack on Pearl Harbor. Two months later, in September, The bomb attack message from Japan requesting a grid of exact locations of ships in Pearl Harbor is deciphered. However, the information was not given to the island's generals.

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A month later, Japanese Adm. Nomura informs his superiors that he has learned Americans were reading his message traffic, but no one believes the code has been read. They believe it's unbreakable, and it has not been changed.

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Two months later, U.S. intelligence officers continue to monitor Japanese secret messages. In a program code-named Magic, U.S. uses a machine to decode Japan's diplomatic dispatches.

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U.S. intelligence officers continue to monitor Japanese secret messages. In a program code-named Magic, U.S. uses a machine to decode Japan's diplomatic dispatches.

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Two months later, U.S. intelligence officers continue to monitor Japanese secret messages. In a program code-named Magic, the U.S. uses a machine to decode Japan's diplomatic dispatches.

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A month later, Kimmel assumes command of the U.S. Pacific Fleet in Hawaii. Kimmel and Walter C. Short, commanding general of the Hawaiian Department, prepare for the defense of the islands.

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In 1941, Yamamoto begins communicating with other Japanese officers about a possible attack on Pearl Harbor. Most senior American military experts believe the Japanese would attack Manila in the Philippine Islands if war broke out, so the information was brushed off.

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In 1940, U.S. imposes trade sanctions, followed by an embargo, aimed at curbing Japan's military aggression in Asia. They stopped supplying Japan oil and gasoline.

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Japan invades North China on July 7, 1937. There was a military conflict between the Republic of China and Empire of Japan known as the Second Sino-Japanese War. This was the start of Japan's military actions that eventually lead to the attack on Pearl Harbor.