Rubuta ci gaba don wannan sakin layi - Faduwar Singapore a lokacin Yaƙin Duniya na II ya sa New Zealand ta fahimci cewa ba za ta ƙara dogaro da Burtaniya don kare Daular Burtaniya ba. Sojojin New Zealand sun goyi bayan Burtaniya a cikin nasarar da aka yi a kan 'yan tawayen kwaminisanci a Malaysia
kuma ya ci gaba da rundunar mayakan sojin sama a Singapore, kuma daga baya a Cyprus, sake tallafawa sojojin Burtaniya. Jami'an diflomasiyyar New Zealand sun nemi kawance da Amurka, kuma a 1951 sun bi yarjejeniyar ANZUS tsakanin New Zealand, Australia da Amurka. A musayar garantin Amurka na kariya, New Zealand ta ji tilas ne ta tallafa wa Amurka a yaƙinta, kuma New Zealand ta ba da ƙarfi ga Yaƙin Koriya (1950-1953) a ƙarƙashin kulawar Majalisar Dinkin Duniya da kuma Yaƙin Vietnam. A cikin shekarun 1970, yawancin New Zealanders sun fara jin rashin jin daɗi game da goyon bayan ƙasarsu ga Amurka, musamman a Vietnam da kuma game da ziyarar jiragen ruwa na Amurka masu amfani da makaman nukiliya da makamai. Gwamnatin Kwadago ta Uku (1972<unk>1975) ta janye sojojin New Zealand daga Yaƙin Vietnam kuma sun yi zanga-zangar adawa da gwajin nukiliya na Faransa a cikin Pacific, a wani lokaci ta aika da wani jirgin ruwa na yaƙi don yin aiki a matsayin mai ba da shaida ga gwaje-gwajen.