Japan 1931 - 1990 Humanities A/B By isabel.garcia Jan 1, 1931 Japan took over Manchuria Jan 1, 1937 Japan invaded eastern China Jan 1, 1939 World War II started in Europe Dec 7, 1941 Japanese bombers attack Pearl Harbor in Hawaii Aug 6, 1945 America bombed Hiroshima, Japan with an atomic bomb. Sep 1, 1951 The American occupation in Japan ended and Japan signed a pece treaty with most of the countries that they fought against during the war