This article was largely, well, stupid.
Sure, Denver is only 10% black, a whole 2.5% less than the national average. Give me a break! 1 out of 10 people are black, and 1/3 are Hispanic, that seems far more diverse than Scandinavia.
Another city, Austin, 35% Hispanic and 5.5% asian. Very diverse if you ask me. Again, 8% black does not mean the black community has no presence. There are still a lot relative to some places in this country.
As for Minneapolis, Wikipedia says the city itself is 17% black.
Essentially, this article is total BS 
Yes... 17% black in Minneapolis.. but they're not all really black because many of them are immigrants from Africa.
Apparently diversity is determined only by how many African Americans you have in your city
The truth of the matter is: Minneapolis is still the most diverse city in the state of Minnesota. Try Duluth once.. it's like 97% white. Though it is kinda funny that whites in Duluth are likely more progressive than Minneapolis whites.
