What was the biggest cause of Pearl Harbor?

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The primary cause of Pearl Harbor was Japanese Aggression.  Japan, under Emperor Tojo, had formed alliances with the other two Axis powers, Germany and Italy.  The belief was the the war in Europe gave a nation such as Japan the perfect element of diversion to be able to control the Pacific Island nations.  While Europe was trying in desperation to stave off Hitler, the efforts were not very successful.  For its part, America was firmly committed to pursing a policy of isolationism, not wanting to involve itself in the "affairs of Europe."  However, privately, President Roosevelt and the government knew American entry into the war was inevitable.  America had been giving support to Britain in its fight against Hitler and Mussolini with acts such as The Lend-...

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