Joseph Smith, the author of the Book of Mormon, also told of cities in the New World, built by Middle Easterners who sailed to North America in enclosed submarine type boats. He also wrote of pitched battles involving tens of thousands of people using metal weapons and armor.
For the more on the connection with the Book of Mormon such mysteries, see "Mound Builders of Ancient America," by Robert Silverberg, New York Geographic Society, 1968. It is contains an entertaining overall history of the myth of "exotic" origins of the mounds of North America.
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