The ultimate aim of the surprise attack on Pearl Harbour on 7th December 1941 was to delay U.S. entry into the war for two years by destroying their naval force in the pacific. During this attack on Pearl harbour Japan aimed to destroy their oil reserves, destroy their aircraft carriers, their submarines and destroyer ships. Japans estimate that they only had enough war resources for a war of two years if the supply blockade was not dropped meant that they hoped to conquer islands in the pacific, including the Dutch East Indies, which had vast oil supplies which the Japanese needed to support their war time efforts. This could only be achieved however by destroying the American naval base in this area and forcing the Americans back to the west coast. By keeping the Americans out of the war for two years the Japanese planned of having control of a vast area of the pacific and once the Americans were able to enter the war being able to maintain control and keep the Americans at bay.
Japanese citizens had lost much faith and pride