Trump voters tend to be older, blue-collar workers, and recent generations have had more difficulty getting well-paying jobs that didn’t require much education. Those opportunities have largely dried up. And now, Trump supporters tend to live in places where the world has gotten visibly tougher for the kids on the block. It's easier to agree with Trump's narrative about American decline when you have seen your own child fall down the economic ladder.
This may help explain one puzzle that has stumped election observers so far. Trump has found success playing up economic grievances, stoking anxieties about immigrants, and complaining about Chinese competition. How is it then, that so many of his supporters seem to be economically secure? It could be that Trump supporters aren't worried for themselves, but for their children.