隨着戰爭結束,英國與美國間的特殊關係「變得不再那麼特殊」[12]。英國政府確信自己視之為英美共同發現的核技術會被美國政府共享[13],但魁北克協定的條目仍然處於保密中。美國國會的資深議員們在發現協定賦予英國使用核武器的否決權時陷入了震驚[14]。在1945年11月9日,英國新任首相克萊門特·艾德禮與加拿大首相威廉·萊昂·麥肯齊·金前往華盛頓特區,與杜魯門一同商討核武器與核能領域的未來合作[15][16]。他們簽署了代替魁北克協定的意向備忘錄,這份備忘錄將加拿大作為全面合作夥伴,並且將徵得核武器使用許可的義務削減為僅需進行協商[17]。三位首腦同意很快將在核能的軍民用途上達成全面且有效的合作,但是英國方面很快失望了[18];美國清楚地表明了合作僅限於基礎科學研究[19]。《1946年美國原子能法(英語:Atomic Energy Act of 1946)》結束了技術性合作。該草案對「限制性資料」的控制組織了美國的盟友接受任何相關信息[20]。
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