The first time Donald J. Trump ran for president, he slapped on a miner’s helmet and told coal workers they would be “winning, winning, winning” when he entered the White House.

Now, as Mr. Trump campaigns for another chance at the presidency, he rarely mentions America’s coal miners and has stopped making grand promises about their future.

The shift reflects political and economic realities, experts said. Top among them: Mr. Trump oversaw coal’s decline, not its salvation. Despite…

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