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Japan invaded North China from Manchuria ("A Pearl Harbor Timeline").
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The USA enforced trade sanctions and embargo, which were aimed at Japan to slow their agressive military ("A Pearl Harbor Timeline").
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Adm, Yamamoto started communicating with officers from Japan about an attack on Pearl Harbor ("A Pearl Harbor Timeline").
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Joseph C. Grew, the U.S. ambassador to Japan, informs Washington that Japan is planning a surprise attack on Pearl Harbor. No one in Washington believes the information ("A Pearl Harbor Timeline").
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Submarines, the first units involved in the attack, depart Japan ("A Pearl Harbor Timeline").
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Pearl Harbor was attacked ("The Pearl Harbor Attack").
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President Roosevelt asked Congress to declare war with Japan ("A Pearl Harbor Timeline")
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Adm. Kimmel and Gen. Short are relieved of their commands ("A Pearl Harbor Timeline").
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The Roberts Commission appointed by President Roosevelt finds Kimmel and Short in dereliction of duty and solely responsible for the Pearl Harbor disaster ("A Pearl Harbor Timeline").
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Capt. Laurence Safford, the Navy's former chief cryptographer, discovers that officials in Washington withheld secret information from Kimmel and Short ("A Pearl Harbor Timeline").
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Naval Court of Inquiry finds Kimmel had not been derelict but had acted appropriately given what he knew. The Chief of Naval Operations overrules the court, saying if Kimmel had done aerial reconnaissance he might have discovered the Japanese fleet just 250 miles off Hawaii ("A Pearl Harbor Timeline").