Wikipedia
The religious traditions of Latter-day Saint movement speak of the Jaredites as one of four groups (along with the Nephites, Lamanites, and Mulekites) which Mormons believe settled in the ancient Americas.
The Book of Mormon (mainly the Book of Ether) describes the Jaredites as the descendants of Jared and his brother, who lived at the time of the Tower of Babel. According to the Book of Mormon, the people fled across the ocean on unique barges and established an ancient civilization in the Americas.
Almost all historians and archaeologists deny the existence of the Jaredites; both the Smithsonian Institution and the National Geographic Society have stated that they have seen no evidence to support the claims in the Book of Mormon. Mormon archeologists and historians argue parallels between the Olmecs of Mexico, early Asians or descendants of Shem and the Jaredite people.