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  • July 1, 1945 - Leo Szilard begins circulating a petition to President Truman, expressing opposition on moral grounds to using the atomic bomb against Japan.
  • July 9, 1955 - The Russell-Einstein Manifesto is issued, which addresses the dangers of thermonuclear weapons.
  • July 16, 1945 - The Trinity test, a plutonium implosion device, takes place at 5:29:45 a.m. mountain war time at Alamogordo, New Mexico. It is the world’s first atomic detonation.
  • July 21, 1945 - President Truman approves the order for atomic bombs to be used against cities in Japan.
  • July 31, 1991 - President George H.W. Bush and President Mikhail Gorbachev sign the Strategic Arms Reduction Treaty (START), using pens made from melted down SS-20 and Pershing II missiles. The Treaty calls for the elimination of almost fifty percent of the nuclear warheads carried by ballistic missiles.
 
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