Mormon returns to his focus on his people and their condition at his book’s coming forth. Their scattering by the Gentiles is an old prophecy (e.g., 1 Ne. 13), but Mormon restates it here. The Nephites are currently being driven by the Lamanites. The mixed remnant will similarly be driven by the Gentiles. Mormon likely sees the Gentiles’ coming as just such a parallel event, brought on by the parallel wickedness of the mixed Nephite-Lamanite descendants.