Interesting that Joseph Smith "taught" that the inhabitants of the Americas were the "lost tribe of Israel" which could only be argued for years.
Now that we have DNA research, a Mormon DNA researcher did investigate the origin of ancient inhabitants of the Americas and find ...... that they are NOT of any Semitic tribe but rather Oriental (the Mormon research, has, of course, been silenced)!
So much for Joseph's "prophecy."
The X-factor, which is ordinarily present in 3% of any given individual in a North American Indian tribe, points to some degree of European ancestry involving folks who now live in the Sapmai (the Sa'ami, and the foundations of the Church of the First Born), and in North Africa (among people called Berbers).
This all happened about 14,000 years ago though.