What was Japan doing during the 1930s and why? Increase there sphere influence on asians. Why did Japan attack Pearl Harbor, Hawaii on December 7, 1941? It intended to destroy important american fleet units, thereby preventing the pacific fleet from interfering with japanese conquest of the dutch east indies and malaya and to enable japan to conquer Southeast asia without interference. 3) Based on your outside knowledge, how did the United States react to this attack? (If you do not know, predict what you think happened.)

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