Atlantis: The Antediluvian World

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Atlantis: The Antediluvian World is a pseudoscientific book published in 1882 by Minnesota populist politician Ignatius L. Donnelly, who was born in Philadelphia, Pennsylvania in 1831. Donnelly considered Plato's account of Atlantis as largely factual and attempted to establish that all known ancient civilizations were descended from this supposed lost land.
Many of its theories are the source of many modern-day concepts we have about Atlantis, like the civilization and technology beyond its time, the origins of all present races and civilizations, a civil war between good and evil, etc. Much of Donnelly's scholarship, especially with regard to Atlantis as an explanation for supposed similarities between ancient civilizations of the Old and New Worlds, was inspired by the publications of Charles Étienne Brasseur de Bourbourg and the eccentric fieldwork of Augustus Le Plongeon in the Yucatan. It was avidly supported by publications of Helena Blavatsky and the Theosophical Society as well as by Rudolf Steiner. Donnelly's work on Atlantis inspired books by James Churchward on the lost continent of Mu, also known as Lemuria.