Japan 1931 - 1990 Humanities A/B By gyueunpark Jan 1, 1931 Japan took control of Manchuria Dec 7, 1941 Japan bombed the United States military base at Pearl Harbor Aug 6, 1945 The United States bombed Hiroshima Sep 1, 1951 American occupation ended and they signed the peace treaty Jan 1, 1989 Emperor Hirohito's son, Akihito began to rule Japan