Kammala wannan magana: Ƙoƙarin da aka yi a cikin shekarun 1960 don cimma burin farko da ba a san shi ba sannan kuma a ƙarshe ya sauko da wata na mutum ya zama mafi sauƙin fahimta a cikin yanayin siyasa na zamanin tarihi. Yaƙin Duniya na II ya gabatar da sabbin abubuwa da yawa masu haɗari ciki har da hare-haren tashin hankali da aka yi amfani da su a cikin mamayewar Poland da
Finland, da kuma harin da aka kai kan Pearl Harbor; da makami mai linzami na V-2, wani makami mai linzami wanda ya kashe dubbai a hare-haren da aka kai a London da Antwerp; da kuma bam din nukiliya, wanda ya kashe dubban daruruwan a cikin bama-bamai na nukiliya na Hiroshima da Nagasaki. A cikin shekarun 1950, tashin hankali ya tashi tsakanin manyan kasashen biyu masu adawa da akidar Amurka da Tarayyar Soviet wadanda suka fito a matsayin masu nasara a rikicin, musamman bayan ci gaban kasashen biyu na bam din hydrogen.