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  • April 4, 1949 - The North Atlantic Treaty establishes NATO, a military alliance aimed at protecting Western nations from the Soviet bloc.
  • April 10, 1945 - As part of the Manhattan Project, an injured motorcyclist named Ebb Cade was injected with 4.7 micrograms of plutonium without his knowledge.
  • April 11, 2016 - Secretary of State John Kerry visits the Hiroshima Peace Memorial Museum, the first sitting U.S. secretary of state to visit the site.
  • April 24, 2014 - The Republic of the Marshall Islands filed landmark cases in the International Court of Justice and U.S. Federal District Court against the nine nuclear-armed states. They claim that the nuclear-armed nations have failed to comply with their obligations, under the Nuclear Non-Proliferation Treaty and customary international law, to pursue negotiations for the worldwide elimination of nuclear weapons.
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