British hydrogen bomb programme Atomic Energy Act of 1946 (also known as the McMahon Act) ended technical cooperation. Fearing a resurgence of American isolationism, and the loss of Britain's great power status, the British government resumed its own development effort, which was codenamed "High Explosive Research". The successful nuclear test of a British atomic bomb in Operation Hurricane in October 1952 represented an extraordinary scientific and technological achievement. Britain became the world's third nuclear power, reaffirming the country's status as a great power, but hopes that the United States would be sufficiently impressed to restore the nuclear Special Relationship were soon dashed. In November
Las Vegas in the 1950s tests began at the Nevada Test Site, north of Las Vegas ( from downtown Las Vegas) on 27 January 1951. After it was shown on television on 22 April 1952, the Las Vegas town and the nation was gripped by the atomic fever and the Chamber of Commerce even brought out a calendar showing the vantage points to view the atomic sites. Atomic Cocktails, Atomic hair-dos, and Miss Atomic Blast beauty contests became popular with people in some of the casinos. Testing continued until the 1963 Test Ban Treaty came into effect and surface testing was banned and underground testing