华盛顿会议
Warren served as U.S. Ambassador to Japan between 1921 and 1923. His arrival was eagerly anticipated in the context of an upcoming Washington Naval Conference on Far Eastern matters and armaments. Kaneko Kentarō (Harvard '98), Privy Councilor to the Emperor, and president of the America-Japan Society of Tokyo, presided at a formal dinner in honor of the newly arrived Ambassador Warren; and he expressed the hope that the Washington Naval Conference would be a golden opportunity to clear away any misunderstandings and to speak frankly about Japan's aspirations.