Globalisation and free-market capitalism has led (as James Goldsmith foresaw out in the 90s) to the deprecation of the western worker. Unfathomably cheap goods and rising asset prices (particularly property) have dulled the effect, enriching the baby boomer generations beyond what they could have ever imagined - but this mask cannot hold forever.
As the east continues to make ever more labour available, and automation increasingly makes labour irrelevant, the near-monarchistic financial glory felt by the majority in the western world will begin to crack. Indeed, it has - with resurgent inflation and the law of diminishing returns from money printing & debt overheating the powerful but fragile economic engine.
And what happens when things go wrong? Unless we are smart, we blame others. Are those baby-boomers who sit on £500,000 of assets going to feel favourably about anyone that points out their part-time job as a postman shouldn't really have reaped such rewards? No, they will listen to the strong voice that blames the polish coming in, or the chinese for manipulating us (with all their pesky cheap goods), or liberals for forcing change when things used to be good.
Optimistically I hope that Trump is the last death-throes of a dying historical convervatism built on protection from other races/genders/sexualities. But thinking about it, this bizarre sociopath marks but the start.