Well, this would be because of the on the royal power of the king. We had many reasons for this happening but one of the main reasons would be because in the U.S military even the highest military ranking officers would be paid less than the lowest ranking British officer.
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President Truman had the urge to use the atomic bomb against Japan because the American casualties would continuously rise unless the Empire of Japan surrenders. The thing that would make Japan surrender would be a cataclysmic event, and the bombing of Hiroshima and Nagasaki happened.