The attack on Pearl Harbour forced the U.S. to take action. As a result of Japan's attack, U.S.A. was forced to enter into war against Japan, in order that no more atrocities would happen. This was World War II. U.S.A. also entered into a war against Germany, because Germany and Japan were allied, U.S.A. and Germany were then enemies.
to cripple the U.S. naval force in the pacific.
Shinano
U.S. officials were certain that an attack was coming but the forces in the Pacific - in and around Pearl Harbor - were depleted as many were brought closer to US shores as they expected a more direct attack than on Pearl Harbor. When the attack came, it was at a time that bombers were being relocated to Pearl from California and the wave of planes seen on the radar was mistaken for those relocating rather than as an enemy force on the attack.
US general Dolittle (then a colonel)
The Japanese Army was happy with the various attacks on the British, Dutch & Americans (including the Pearl Harbor attack). The Japanese Army was the main force behind the idea of going to war with Britain & the US.
The imperial Japanese air force and navy under command of general Tojo
That's a little presumptuous. We promised if they would attack Pearl we'd kick their $$$ and drop a couple nuclear bombs on their home islands. How could they resist?
My thought - The attack on Pearl Harbor inspired America to take part in World War 2. Their participation, financial and resource abilities made for a powerful force that the rest of the world had not quite realized.
The Japanese attack force lost 55 airmen, nine submariners and one submariner was taken prisoner.
At the time of the Japanese surprise attack in 1941, Pearl Harbor was a US Naval base. So the person in charge was the ranking Naval officer in Hawaii, Admiral Husband Edward Kimmel. The Japanese Commander of the force that atacked Pearl Harbor was Admiral Chūichi Nagumo.
Admiral Isoroku Yamamoto, Commander of the Japanese Combined Fleet, was in overall control of planning for the 1941 surprise attack on the United States Pacific Fleet at Pearl Harbor. Vice Admiral Chuichi Nagumo was commander specifically of the Pearl Harbor Striking Force.
Chuichi Nagumo was the Japanese commander of the Pearl Harbor strike force. He played a significant role in the attack. Nagumo, however, refused to launch additional air attacks on dockyard and fuel tanks on Oahu or to seek out two US aircraft carriers at sea. He was never comfortable with the plan to attack the Pearl Harbor and limited his risks.