 The Atomic Energy Act of 1946 ( McMahon Act ) 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 power management would be under civilian , rather than military control , and that the United States would share the benefits of nuclear power with other nations. kwietnikowska.pl/pl/katalog/wypelnienia/1465-nuclear-power-in-the-21st-century-a-global-outlook-the-challeng