That church also was not particularly welcoming to Black people and expressly for as slavery.
You didn’t have Black people moving there to join a pretty culty religious group, and you didn’t have slavery, so there was very little influx of diversity.
Edit: I’m not certain off-hand if it was made legal-legal or if Brigham just said it was doctrinal, imagine the effect would be pretty much the same either way at the time.
https://en.m.wikipedia.org/wiki/Mormonism_and_slavery
https://en.m.wikipedia.org/wiki/History_of_slavery_in_Utah
Edit: Slavery was legal in Utah from 1852 until 1862 when it was banned by Congress.
It’s not like there’s an intellectually honest way of getting a ban on slavery from Christian Scripture. Mohamed was over 600 years later and substantially more liberal with regard to slavery than was the norm before him and his religion didn’t ban slavery either. The Abrahamic scriptures aren’t really ambiguous on this. God does not object to slavery as such.
The problem was that they were actively writing new scripture that supposedly had equal (if not more) weight than both the Old and New Testament.
Utah can be all-white for entirely nefarious reasons and yet it doesn't follow that any given company (or other organization) in Utah lacks diversity for its own nefarious reasons. It's entirely plausible and likely that the company in question sampled without racial bias from its own hiring pipeline and consequently the company's racial demographics resemble that of its hiring pipeline.
As for why Utah's population is mostly white, I'm guessing the biggest factor is that a predominately white religious sect settled it. I'm sure there's some racial oppression involved as was common at the time, but I don't imagine that that was a particularly strong driver of Utah demographics. However, I could be wrong and it still wouldn't affect my original thesis.
> In the natural state of affairs, since we now have the ability to move around the planet faster than we reproduce, entropy would have the world be an even distribution.
I'm not actually sure that we can move around the planet faster than we reproduce. This is perhaps true for the wealthiest 1% or so of the global population. Moreover, to the extent that it's true, it hasn't been true for long enough to expect some global homogeneity absent discrimination. Absent any segregating forces (malicious or benign--more on benign segregating forces below), it would probably take millennia to get some discernible global racial uniformity. Further, there are benign segregating forces--for example, people of all racial groups tend to exhibit a preference for living in communities which share their language, culture, religion, and traditions (note that the standard group generalization disclaimers apply--this doesn't apply to every individual in the group and it doesn't suggest that this force is uniform across racial groups, etc). Similarly, the nations with the most gender freedom exhibit the least occupational gender diversity and the nations with the least gender freedom exhibit the most occupational diversity.