Rubuta ci gaba don wannan sakin layi - Farawa a shekara ta 1931, tashin hankali ya ƙaru. Ayyukan Jafananci a kan China a 1931 kuma musamman bayan 1937 a lokacin Yaƙin Sino-Japan na biyu ya sa Amurka ta yanke man fetur da ƙarfe da Japan ke buƙata don cin nasarar soja. Japan ta amsa da hare-hare a kan Allies, ciki har da mamakin kai hari a kan Pearl Harbor a ranar 7 ga Disamba, 1941, wanda ya yi mummunar lalacewar sansanin sojan ruwa na Amurka a Pearl Harbor, yana buɗe wasan kwaikwayo na Pacific na yakin duniya na biyu. Amurka ta sanya jari mai yawa a cikin karfin ruwa kuma ta lalata damar da Japan ke da ita yayin da take tsallake tsibirin a fadin Pacific. Don su tilasta wa mutane su miƙa kai, Amirkawa suka yi ta kai harin bama-bamai a kan biranen Japan, wanda ya kai ga jefa bama-bamai a kan Hiroshima da Nagasaki a watan Agusta na shekara ta 1945. Kasar Japan ta mika wuya
, kuma ya kasance ƙarƙashin shekaru bakwai na mamayar soja ta Amurka, a lokacin da Amurkawa masu mamayewa a ƙarƙashin Janar Douglas MacArthur suka kawar da batun soja kuma suka sake gina tsarin tattalin arziki da siyasa don canza Japan zuwa dimokiradiyya.