The attack on Pearl Harbour took place on December 7th, the rest as they say is history but maybe not as we were taught at school:
For decades, conventional wisdom held that Japan attacked without any official warning of a break in relations only because of accidents and bumbling that delayed the delivery of a document to Washington hinting at war. In 1999, however, Takeo Iguchi, a professor of law and international relations at the International Christian University in Tokyo, discovered documents that pointed to a vigorous debate inside the government over how, indeed whether, to notify Washington of Japan's intention to break off negotiations and start a war, including a December 7 entry in the war diary saying, "our deceptive diplomacy is steadily proceeding toward success." Of this, Iguchi said, "The diary shows that the army and navy did not want to give any proper declaration of war, or indeed prior notice even of the termination of negotiations ... [a]nd they clearly prevailed."
We forget what evil bastards the Japanese were, partly because their depravity took place on the other side of the world, and the US still defends Japan so that it doesn't need to raise its won armed forces.