I reira e wha e mohiotia ana putunga nui o te uranium i roto i 1940: i roto i Colorado, i roto i te raki o Canada, i roto i Joachimsthal i Czechoslovakia, me i roto i te Belgian Congo. katoa engari Joachimstal i i roto i ringa allied. whakatau he rangahau Whiringa-ā-rangi 1942 e i nui nui o te uranium i wātea ki te whakatau i ngā whakaritenga o te kaupapa. whakaritea Nichols ki te Tari State mō mana kaweake ki te kia whakanohoia i runga i te waikura uranium me te kōrero mo te hoko o 1,200 taranata poto (1,100 t) o te uranium konganuku i te Belgian Congo i te rongoa i roto i te whare putunga i runga i Staten Island me te toenga o te rahui o te minita o te konganuku i roto i te parahi, i roto i te poma karihi. i roto i te tau 1944 i kite te kawanatanga o Ingarangi i whaihanga nui e wha o nga moni o te uranium i roto i Colorado, i roto i te raki o Canada, i Joachimsthal i Czechoslovakia
Ko te tau 1942