According to the Book of Mormon, both they and the Lamanites descended from Lehi, a Jew who came to America in 600 B.C. The Nephites were his faithful descendants, who became corrupt, and were finally destroyed by the Lamanites. Much of the Book of Mormon is a description of the wars between these two groups.
Dictionary of Mormonese
Nephites
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Dictionary of "Mormonese"
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