Sources of Partisan Change: Evidence from the Shale Gas Shock in American Coal Country

What explains the shift to Republicans in places that historically voted for Democrats? This article tests a new explanation for part of this reversal. The shale gas revolution displaced coal, which intensified the salience of national environmental regulations and increased support for Republican presidential candidates. Analysis of presidential elections from 1972 to 2020 with a difference-in-differences design finds that the shale gas shock increased Republican vote share by 4.9 percentage points. Geospatial data, media analysis, and interviews show that voters blamed environmental regulations for their community’s decline and that the backlash was more likely to occur where the shale shock was least visible. The attribution of blame for economic dislocation helps to explain electoral behavior in places “left behind” and sheds light on political responses to climate policy.