T&S says that the Nephites lived in Central America.
Joseph Smith (editor), “Extract from Stephens’ ‘Incidents of Travel in Central America,’ ” Times and Seasons 3, no. 22 (September 15, 1842): 915
Mr. Stephens' great developments of antiquities are made bare to the eyes of all the people by reading the history of the Nephites in the Book of Mormon. They lived about the narrow neck of land, which now embraces Central America, with all the cities that can be found. Read the destruction of cities at the crucifixion of Christ, pages 459-60. Who could have dreamed that twelve years would have developed such incontrovertible testimony to the Book of Mormon? surely the Lord worketh and none can hinder.