Interesting ... I would have guessed that both the coasts would be mostly green-ish and the central parts mostly red-ish (shows you what I know about US demographics!).
Looks like a lot of this is due to fracking for oil in regions they are not exactly boom towns to begin with. Frackers are going to make a lot more than what the median wages in these areas, most of them are way are out in the boonies. Take North Dakota, east Texas, or Alaska . The 10 highest paid jobs are all related to oil fracking, not to mention how desolate these places are. ps://finance.yahoo.com/news/10-highest-paying-jobs-north-194500418.html
Fracking destroys the ecosystem & makes the drinking water flammable/toxic. If someone was fracking in you area you would hate it.
Agreed, the full cost of fracking is just beginning to be understood (and actively discredited due to greed.) https://www.conserve-energy-future.com/compelling-reasons-ban-fracking-that-will-blow-your-mind.php