Roswell UFO incident

 In mid 1947, a United States Air Force balloon, mistaken for a UFO, crashed at a ranch near Roswell, New Mexico, prompting claims that the crash was of an extraterrestrial spaceship. Following wide initial interest, the military stated that the crash was merely of a conventional weather balloon. Interest subsequently waned until the late 1970s, when ufologist’s began promoting a variety of increasingly elaborate conspiracy theories, claiming that one or more alien spacecraft had crash-landed, and that the extraterrestrial occupants had been recovered by the military, who then engaged in a cover-up.

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