The complete electoral collapse (2012) only happened after a Democratic administration openly and gleefully pursued policies sure cause the collapse of most of the remains of the industry and then proceeded to gloat about it. Like, this isn't really a mystery everyone...
So Sibboleth, what happened in short, medium, and longer term electoral voting patterns in the UK (Midlands, Wales, etc...) after Thatcher destroyed the NUM after the massive Coal Miner Strike of '84-'85?
Although I am extremely supportive of the UMWA, and still have a camouflage UMWA T-Shirt that was given to me by a 3rd generation Ohio Coal Miner, because of solidarity work that I did at college in support of the strike of '93, that was basically an extension of the Pittston Strike of '89/'90 that shut down much of the Coal Production in Appalachia against the practice of "double-breasting" (Coal Operators shutting down Union mines/pits and opening up non-union mines a few hollers down, combined with shifting operations to open non-union giant pit-mines in Wyoming and elsewhere in the Mountain West....
So what in your opinion that the Obama administration did was seen as declaring war on Coal Country?
I don't recall anything specifically..... rather the "Free" trade agenda that Obama pursued, as most of his Democratic and Republican predecessors alike, allowed the "invisible hand of the market" to do its thing, and encouraging everything from oil pipelines from Canada, "fracking" and natural gas production, and supporting shipping literally boatloads of Wyoming Coal to China (Much of this produce leaves out of Ports in Oregon)....
I am sure there is still plenty of Union Coal in Appalachia to continue fueling the aging Coal Power Plants of America, where 33% of our energy supply is still based upon Coal....
If anything, the War on Coal is actually happened directly as a result of
imports of Coal from other parts of the World, that is considered "cheaper", than buying locally produced Coal from our Union Mines of places in West Virginia, Kentucky, Ohio, Virginia, etc....
https://www.americangeosciences.org/critical-issues/faq/how-much-coal-does-us-export-and-import