evidence: President Donald Trump promised a new dawn for the struggling U.S. steel industry in 2016, and the lure of new jobs in Midwestern states including Michigan helped him eke out a surprise election win. Four years later, Great Lakes Works — once among the state's largest steel plants — has shut down steelmaking operations and put 1,250 workers out of a job. A year before the June layoffs, plant owner United States Steel Corp called off a plan to invest $600 million in upgrades amid deteriorating market conditions. [...] Trump made similar 2016 campaign promises to revive the ailing coal industry by rolling back environmental regulations. But that industry's employment has dropped 9 percent since 2016, to about 46,000, as 66 coal plants —nearly one-fifth of the U.S. total — have closed. The economic losses come despite the administration's moves to ease restrictions including limits on carbon emissions and dumping coal waste into streams.