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The document outlines the history of nuclear non-proliferation treaties from the 1940s through the 1960s. It discusses key events like the US testing nuclear bombs on Hiroshima and Nagasaki in 1945, the Soviet Union testing its first nuclear bomb in 1949, the UK and France testing bombs in the 1950s, China's first nuclear test in 1964, and draft proposals of nuclear non-proliferation treaties in the 1960s, culminating in the Nuclear Non-Proliferation Treaty entering into force in 1970.























