In this June 28, 1979, photo, U.S. President Jimmy Carter talks with Japanese Crown Prince Akihito as Canadian Prime Minister Joe Clark chats with Princess Chichibu at a banquet given by Emperor Hirohito for heads of state attending the economic summit in Tokyo. When he abdicates April 30, 2019, Akihito will become the first emperor in Japan‚Äôs modern history to see his era end without ever having a war. (AP Photo)