Obiwan wrote:"Lamanite" was/is the Book of Mormon equivalent of the Bibles "Gentile"....
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Yes, quite true. After 4th Nephi.
Everything before 4th Nephi has the Lamanites as a generally distinct racial group, set apart by their divinely bestowed dusky hue. Even with the addition of the Priests of King Noah and several other evil doers, and the reverse direction of the Anti-Nephi-Lehi's and other dissenters and converts to the Church the racial differences are stark and clear, until after the people are united after Christ's appearance.
The Mulekites and other peoples who joined the Nephites are described by the Nephites as being like them. So the racial distinctions still apply.
It's at that point, about 300 years later, that 'the followers of god are called Nephites' and the others are called Lamanites
4 Nephi 1:20
You have read the book, I presume?