I come from a Mormon back ground, though I don't believe in it let alone do the people you've listed believe in it either. As much as I dislike alot of the globalist shills prevelent among high Mormons the actual book of Mormon, the religion, and early community was very focused on a white american mythos and theology.
The Mormons believe that basically Aryan Jews were commanded by God to flee israel to a continental promised land in order to flee the anticipated babylonian captivity. That they sailed from Israel to the Americas and established a holy city in where would be Maya/Aztecan lands. That the original Aryan Jew family would split up into two groups, one the nephites based on righteousness and tradition and the lamanites based on wickedness and abandoment of tradition.
The lamanites abandoned their religion and morals and became savages so God cursed them with a "skin of Blackness" as a way of seperating them from the "white and delightsome" nephites.
The white nephites and dark lamanites basically had a race war until 0 AD to then which the resurrected and glorified Jesus Christ traveled to the Americas to meet with his "other flock" as described in the bible. Jesus Christ makes covenants with Nephites and the white nephites are basically White Christians facing off the Wicked Brown Godless Lamanites.
Because the Lamanites outnumbered and with the work of satan the Lamanites eventually would win the race war and went on to genocide the White Christian Nephites.
One Nephite was left named Moroni who was a prophet of God who in 420AD buried a record on gold plated tablets containing the records of the Ancient Inhabitents of the Americas.
Joseph Smith, the WASP Farmer would then be called upon by God to undercover these records and translate them creating the Book of Mormon.
Smith and his new church went on to genocide the wicked lamanites as revenge for killing off the nephites and as a way of reclaming the promised land for White Christians.
Also he had revelation that polygamy is cool and that when you die, your after is basically becoming God yourself like your heavenly Father and you get to create planets and colonize them with the spirit children you've created through endless sex with your hot Godess wives.
Mormons basically believe the meaning of life is a weird form of evolution that takes place on a cosmic scale where humans are live on earth so that they may grow to become potential gods and rule over their own planets.
Mormonism is pretty cool in my opinion but maybe its cuz I'm biased. If Mormons werent such good goys for the most part the church would be great.