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The United Kingdom publicly announced that it was independently developing nuclear weapons, after the US Atomic Energy Act of 1946 ended cooperation on the matter.
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High Explosive Research
UK atomic bomb development project
High Explosive Research (HER) was the British project to develop atomic bombs independently after the Second World War. This decision was taken by a cabinet sub-committee on 8 January 1947, in response to apprehension of an American return to isolationism, fears that Britain…Source: Wikipedia (CC BY-SA)
Atomic Energy Act of 1946
US law on the control and management of nuclear technology
The Atomic Energy Act of 1946 determined how the United States would control and manage the nuclear technology it had jointly developed with its World War II allies, the United Kingdom and Canada. Most significantly, the Act ruled that nuclear weapon development and nuclear…Source: Wikipedia (CC BY-SA)