The Book of Mormon is consistent in its use of the word “nation”, as Bruce E. Dale and Brian Dale explain:
Throughout the Book of Mormon itself there is never a reference to “Nephite nation” or to a “Lamanite nation.” Interestingly, the word nation is used in reference to the Jaredites (Ether 1:43), a very different people culturally than the Lehites. The Book of Mormon uses this phrase: “nations, kindreds, tongues and people.” The Nephites and Lamanites were clearly kindreds. In contrast, the word nation is used frequently in terms of the “nations of the Gentiles.” The noncanonical Guide to the Scriptures has eight references to “Nephite nation,” showing how deeply engrained this idea of nationhood is in modern readers. But the Book of Mormon never puts those two words together for Nephite/Lamanite societies. The nation-state is not a political structure found anywhere in the Book of Mormon. Instead, the Book of Mormon peoples were organized politically in city-states. Often one city-state would dominate a group of other city-states. This dominance is the subject of the next correspondence
The correspondence is specific and detailed. There is not a single reference in the text of the Book of Mormon to “Nephite nation” or “Lamanite nation.” It is also unusual. Joseph Smith was growing up in the new nation of America, with a great deal of pride and self-identity as an independent nation. How did he avoid identifying the Lamanite or Nephite peoples as “nations”? But he did avoid it. What a lucky “guess” — over and over again during the course of the Book of Mormon history.– Bruce E. Dale and Brian Dale – Joseph Smith: The World’s Greatest Guesser (A Bayesian Statistical Analysis of Positive and Negative Correspondences between the Book of Mormon and The Maya)
How did Joseph Smith manage to avoid making such an easy mistake?