According to the Book of Mormon, a Lamanite is a member of a dark-skinned nation of indigenous Americans that battled with the light-skinned Nephite nation. Although mainstream archaeologists, geneticists, and historians do not recognize the existence of Lamanites, adherents of the Latter Day Saint movement typically believe that the Lamanites comprise some part, if not the primary origin, of the indigenous peoples of the Americas, as well as the Polynesian people.
The Book of Mormon describes the Lamanites as descendants of Laman and Lemuel, two rebellious brothers of a family of Israelites who crossed the ocean in a boat around 600 BCE. Their brother Nephi founded the Nephite nation. The Lamanites reputedly gained their dark skin as a sign of the curse for their rebelliousness (the curse itself being the withdrawal of the Spirit of God), and warred with the Nephites over a period of centuries. The book says that Jesus appeared and converted all the Lamanites to Christianity; however, after a couple hundred years, they fell away and eventually exterminated all the Nephites. By the end of the Book of Mormon, the Lamanites were defined less by their skin color than by their lack of Christianity. Many Mormons believe that the Polynesian people originated from the descendents of Hagoth who led his people off on a ship and was never heard from again. Although Hagoth was a Nephite, these Mormons regard Polynesians as Lamanites.
The existence of a Lamanite nation has received no support within mainstream science or archaeology. Genetic studies indicate that the indigenous Americans are primarily from northeast Asia, and the Polynesians are from southeast Asia. This has led many Mormon apologetic scholars to hypothesize that the Lamanites were a small nation that merged with the indigenous population of northeast Asian origin and left no clear traces surviving into the modern world. Within the culture of Mormonism, indigenous Americans and Polynesians are still often called "Lamanites", but the practice is waning.