Roswell and the Evolution of the Flying Saucer Narrative (1947–1950)

To the point

From the 1940s onward, flying saucers moved from initial earthbound explanations for sightings to a widespread belief in alien origins, driven by Kenneth Arnold’s 1947 sighting and later by the works of Donald Keyhoe, Frank Scully, and George Adamski, as well as by Hollywood films that popularized extraterrestrials.

Kenneth Arnold, Roswell, and the term Flying Saucer
patrickabbott.net

Kenneth Arnold, Roswell, and the term Flying Saucer

Aliens are a Retcon