John A. Widtsoe and Franklin S. Harris Jr., write that the BOM allows for other non-Lehite peoples to be present in ancient America.
John A. Widtsoe and Franklin S. Harris Jr., Seven Claims of the Book of Mormon: A Collection of Evidences (Independence, MO: Zion’s Printing and Publishing, 1937), 87
6. Successive Civilizations. Three separate and distinct settlements of America are reported by the Book of Mormon. The first, the Jaredites, dates from the Tower of Babel, the other two, the Nephites and Mulekites, from the time of Zedekiah, King of Judah. There may also have been others not recorded in the Book or not known to the ancient authors.