Rubuta ci gaba don wannan sakin layi - Ƙoƙarin da aka yi a cikin shekarun 1960 don cimma burin farko ba tare da mutum ba, sa'an nan kuma a ƙarshe mutum ya sauko da wata ya zama mafi sauƙin fahimta a cikin yanayin siyasa na tarihin tarihinsa. 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 mamaye Poland da Finland
, da kuma kai hari 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 daruruwan dubbai 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.