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       Social network analysis is a tool that is used to view relationships as a diagram (Krebs, 1). In the case of the attack on Pearl Harbor, it can be used to show all of the people who made the decision and the people who were affected by that decision.  This explanation is meant to be used as a tool to work through the diagram step by step to aid in the understanding of the analysis.

       Starting at the top left,  we can see the Emperor of Japan, Hirohito. He is clearly at the top of the network, and he made the final decision to attack Pearl Harbor.  He commands Prime Minister Hideki Tojo (Hideki, 1). In the months preceding the attack on Pearl Harbor, Tojo felt that a war with the United States was unavoidable, and that the best option would be to use the attack on Pearl Harbor as a way to knock the United States out of the war in the Pacific for at least a year, so that Japan could dominate. As the Prime Minister, Tojo approved the attack to Chief of Naval General Staff Admiral Osami Nagano.  At the time, he was the most senior officer of the Japanese Navy. He opposed going to war with the United States, because he felt that the United States had an unstoppable industrial machine that could support a war that Japan could not match. The only reason he approved the war was because Admiral Yamamoto, the Commander of the Combined Fleet threatened to resign if Nagano did not agree. Yamamoto was the mastermind of the entire Pearl Harbor attack (Evans, 1).

       Moving to the center of the diagram, we can see that Nagano commands his naval forces to attack the United States at Pearl Harbor. This causes a reaction from the President of the United States, Franklin D. Roosevelt to ask Congress for a formal declaration of war against Japan (Franklin, 1). He also appoints Chester Nimitz to the position of Fleet Admiral of the United States Navy, who successfully organizes the naval forces of the United States to halt to Japanese offensive in the Pacific (Chester, 1).

       Had this analysis been expanded to include the entire effects of the war began by the attack on Pearl Harbor, we could include the people and economies of Japan and the United States.  We could also include the United States’ involvement in WWII against the other Axis forces, the eventual surrender of Germany, and the use of the atomic bomb against Japan. 

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