Trump also made promises he simply cannot keep. Automation has removed far more manufacturing jobs than offshoring has. Even if companies were forced to bring their plants back to the US (something that's not going to happen), these would not be the skilled labor jobs of two generations ago and they wouldn't pay significantly better than Walmart. Technology prohibits this approach to economic revival unless we go full-scale controlled economy with manufacturing, and history clearly shows that controlled economies only produce additional poverty. 

Then there's the promise to shred NAFTA and other trade agreements and kick out illegal aliens. The primary way this would impact all Americans would be in vastly increased grocery bills. Between imports and migrant labor, we enjoy some of the proportionally lowest grocery prices ever. And say goodbye to fresh produce in wintertime.

The Democrats ignored the white working class while Trump sold them false hopes. I'm unsure which was worse.