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Japan invades North China from Manchuria
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The U.s. imposes and ends trade sanctions, hoping to curb Japan's agression in Asia.
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Adm. Yamamoto communicates with other Japanese military officers about a possible attack on Pearl Harbor.
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Joseph C. Grew, U.S. ambassador to Japan, warns Washington about the surprise attack on Pearl Harbor. However, no one in Washington believes him.
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U.S. intellegence officers monitor Japanese secret messages.
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Japanese Adm. Nomura informs his superiors that the U.S. was reading and breaking the secret Japanese code. No one in Tokyo believes him and the code remains unchanged.
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Adm. Yamamoto trains his forces and finalizes the attack on Pearl Harbor.
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Japan attempts to get the U.S. to agree to its expansion of Asia diplomatically. However, if unsuccessful, Japan is ready to go to war.
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Submarines depart from Japan to Hawaii.
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Aircraft carriers and escorts begin the attack on Hawaii and leave Japan.
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The Japanese launch 350 planes and 6 aircraft carriers on Pearl Harbor. The attack lasts for 2 hours and 20 minutes.
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The U.S. Congress officialy declares war on Japan.