Kammala wannan jumla: Amurka ta taka rawar gani a taron Bretton Woods da Yalta, wanda ya sanya hannu kan yarjejeniyoyi kan sabbin cibiyoyin hada-hadar kudi na kasa da kasa da kuma sake fasalin Turai bayan yakin. Yayin da aka sami nasarar Allied a Turai, wani taron kasa da kasa da aka gudanar a 1945 a San Francisco ya samar da Yarjejeniyar Majalisar Dinkin Duniya, wanda ya fara aiki bayan yakin. Amurka da Japan sun yi yaƙi da juna a cikin yaƙin ruwa mafi girma a tarihi, Yaƙin Leyte Gulf. Amurka ta kirkiro makaman nukiliya na farko kuma ta yi amfani da su a Japan a biranen Hiroshima da Nagasaki a watan Agusta 1945; Jafananci
ya mika wuya a ranar 2 ga Satumba, ya kawo karshen yakin duniya na biyu.