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Due to of Japan's conquer of Northern French Indochina, the U.S. placed an embargo on Japan. The U.S. had forbidden the exportation of steel, scrap iron, and aviation fuel; this would slow Japan's progress and create a growing tension between the two countries.
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Japan conquered southern Indochina. This caused the U.S., Britain, and the Netherlands to freeze Japanese assets, which would have disabled the Japanese air force over time.
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Japan tries to take the oil resources of southeastern Asia and get the embargo lifted. In case they could not meet these conditions, they prepared for war.
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Secretly, General Tojo Hideki set this day as the last day he would go without reaching an agreement to get their embargo lifted under terms that will still let him take the land that the Japanese army wanted.
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Due to the Soviet Union nearly defeated from the attack of the Axis powers, Japan attempted to again take the oil resources from Southeastern Asia. The U.S. demanded that Japan withdraws from Asia, but were not willing to go to war.
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Pearl Harbor is bombed by the Japanese. The attack caused 3,303 Americans, about 2,000 of them U.S. armed forces, were killed or went missing. At the time, Japanese envoys were holding peace talks in Washington.
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The U.S., Canada, and Great Britain declare war on Japan due to the bombing of Pearl Harbor, the Philippines, Singapore, Guam, and Manila.
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The Battle of Midway started at 10:26 and was Japan's first attack on the U.S. after Pearl Harbor. The Japanese had intended to surprise Midway, but the U.S. had discovered most of the plan beforehand and bombed them before they attacked.
