True or false the mormons were unique in their belief that the indians were descendants of a lost tribe of hebrews.

True, Mormons believe that Indians come from the lost tribes of Hebrews or the lost tribes of Israel. The lost tribes were believed to came in America. Although, it was a debate whether the Indians really did come from the lost tribes, Mormons believed that it is in the scripture, the Book of Mormon. Lehi is an Israelite and Nephi's descendant Aminabi came from Jerusalem.  Also, there are studies of this migration that was also pointed in the Mormon Bandwagon for more detailed explanation.

https://mormonbandwagon.com/dave/tribe-manasseh-2/