 In the event that there is no prospect of our demands being met by the first ten days of October through the diplomatic negotiations mentioned above, we will immediately decide to commence hostilities against the United States, Britain and the Netherlands.The Vice Admiral Isoroku Yamamoto, the chief architect of the attack on Pearl Harbor, had strong misgivings about war with the United States.Yamamoto had spent time in the United States during his youth when he studied as a language student at Harvard University (1919–1921) and later served as assistant naval attaché in Washington, D.C. Understanding the inherent dangers of war with the United States, Yamamoto warned his fellow countrymen