How many coal miners has he put back to work? How many factories has he reopened? I don't think he has managed to do much of anything other than to sign the tax reform bill and try to eliminate some environmental regulations (the only ones that they have undone were the easy ones that were promulgated by Obama late in the second term; the rest of the work they are doing has to go through notice and comment rulemaking and probably litigation). Not an especially great track record IMO.
Hillary wrote these people off as deplorables. Trump is at least trying. He eliminated at lot of regulation on coal which is helping the industry expand. He pulled out of Paris giving a boost to the coal industry. There's more coal exports. Coal production is up 10% over last year. The economy is better. GDP % is the highest it's been in a long time. Stock market is up 35%. More people are employed in 40 years including blacks at the highest level ever. Company's profits are way up. They can't find enough workers. Tax legislation was completed helping the lower middle class. If you were a coal miner, would you prefer Hillary or Trump?
Some statistics regarding manufacturing:
"Employment in manufacturing continued to grow in June (+36,000).
Over the year, the industry has added 285,000 jobs, for a 2.3-percent
increase. The last time this industry experienced this pace of growth
occurred in February 1995 (+2.4 percent).
"
I can't find labor statistioc for coal miners specifically, but here are statistics for mining in general, probably mostly oil. So maybe coal miners are switching to oil??
"Employment in mining continued its upward trend in June (+5,000). Support activities for mining contributed 4,000 jobs to the gain. So far in 2018, mining has added 40,000 jobs, with 76 percent (+31,000) coming from support activities for mining. The recent job gains are consistent with increasing numbers of domestic oil rigs , up 1.3 percent between May and June. "
https://www.bls.gov/web/empsit/ceshighlights.pdf