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Americans cracked codes Japan used in sending secret messages. U.S. was aware of Japan's plans for Southeast Asia.
http://chris-intel-corner.blogspot.com/2012/07/japanese-codebreakers-of-wwii.html -
He planned attacks on British, Dutch, and American outposts. He is
Japan's greatest naval strategist
http://www.thehistoryreader.com/modern-history/yamamoto-planning-pearl-harbor/ -
Japan's plans for surprise attack on U.S. were begun as early as January of 1941. Japan viewed Pearl Harbor as an easy target because Americans would not expect it and it would weaken their defenses.http://www.thehistoryreader.com/modern-history/yamamoto-planning-pearl-harbor/
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After Japan invaded Indochina, Roosevelt cut off oil shipments to Japan. Japan needs oil to fuel war machines
https://www.history.com/this-day-in-history/united-states-freezes-japanese-assets -
Over 2,400 Americans died and 1,000 wounded https://www.history.com/topics/world-war-ii/pearl-harbor
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20 naval vessels and 300 airplanes destroyed https://www.history.com/topics/world-war-ii/pearl-harbor
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Pearl Harbor was a U.S. naval base on the Island of Oahu in Hawaii, in which Japan did a surprise attack on the harbor https://www.history.com/topics/world-war-ii/pearl-harbor
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Roosevelt addresses congress, he said, "a date which will live in infamy" https://www.history.com/topics/world-war-ii/pearl-harbor
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Almost at the same time as Pearl Harbor, Japan attacked the U.S. territory of Guam https://www.history.com/topics/world-war-ii/pearl-harbor
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Congress accepted Roosevelt's request to declare war on Japan and their allies. https://www.history.com/topics/world-war-ii/pearl-harbor
