I'm digging through this map and want to comment on trends on the Great Plains. Apart from above-average growth in the Kansas city area, there are a few counties that stick out in Nebraska, Iowa, Kansas and northern Texas. You can also add in Nobles County in Minnesota.
For those who don't know, the answer is meat. All those counties in which the non-white population is increasing at double the national rate are home to meat packing plants; southwest Kansas is a major transit hub for meat; and the Oklahoma/Texas panhandles, flat as they are, have relied on ranching (The Worthington meat processing plant in MN was subject to an illegal immigration raid a few years back.) The rises there are almost entirely Hispanic, where they provide cheap labour in a naturally growing but dangerous profession. Same goes for that one dark brown county in Montana - Phillips County, that state's meat hub.
The same trend should also be taking place in Florida, only with oranges instead of meat. That is also more well known.
It's important to note that these rapid demographic transformations haven't been without strife. The meat-packing industry used to offer decent paying, oftentimes unionized jobs for white Americans in these states and the wave of Mexican immigration has come in the wake of union busting, layoffs and reductions in standards. The result has been severe backlash in these communities. Truly the most of unfortunate of circumstances from a leftist perspective: struggling whites political energies are focused on explicitly racist policies while Mexicans, certainly disposed to left-minded rhetoric, are forced to fight for their very existence instead of participating in organizing drives.
