Coal miners prepare for their shift in Gilbert, West Virginia, May 2014. 
Robert Galbraith / Reuters

"He who establishes conventional wisdom owns history,” a historian once told me. So it’s no surprise that ever since last year’s extraordinary U.S. presidential election, all sides have been bitterly fighting over what happened—and why. The explanations for Donald Trump’s surprise victory have varied widely. But one factor that clearly played an important role was the alienation and disaffection of less educated white voters in rural and exurban areas. Trump may have proved to be a uniquely popular tribune for this constituency. But the anger he tapped into has been building for half a century.

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