Kammala jumla mai zuwa: Thant ya sanar a shekarar 1966 cewa ba zai tsaya takara ba a karo na biyu, amma ya amince da daftarin lokacin da Kwamitin Tsaro ya tabbatar masa cewa ba zai zama "mai daraja ba". A ranar 2 ga Disamba, 1966, Babban Taron ya sake nada Thant zuwa wa'adin da ya ƙare a ranar 31 ga Disamba, 1971, bisa shawarar kwamitin tsaro. A lokacin wa'adinsa na biyu, ya kula da shigar da sabbin jihohin Asiya da Afirka a cikin Majalisar Dinkin Duniya, kuma ya kasance mai adawa da wariyar launin fata a Afirka ta Kudu. Ya kuma kafa yawancin ci gaban Majalisar Dinkin Duniya da hukumomin muhalli, kudade da shirye-shirye, gami da Shirin Bunkasa Majalisar Dinkin Duniya (UNDP), Jami'ar Majalisar Dinkin Duniya, taron Majalisar Dinkin Duniya kan Ciniki da Ci gaba, Cibiyar Horarwa da Bincike ta Majalisar Dinkin Duniya (UNITAR), da Shirin Muhalli na Majalisar Dinkin Duniya. Yakin kwanaki shida tsakanin kasashen Larabawa da Isra'ila, da Prague Spring da kuma mamayewar Soviet na Czechoslovakia, da kuma
Yaƙin Indo-Pakistan na 1971 wanda ya haifar da haihuwar Bangladesh duk ya faru ne a lokacin da yake zama babban sakatare.