Here are a few powerful factors that Trump’s ugly campaign exploited:
Hate is the most powerful of unifying agents.
Humans inherently work on a system of tribalism —my family, race, religion, local and party.
The “new” poor are always the most frustrated and vulnerable to demagoguery. They, unlike the chronic poor, remember the good times — the product of golbalization.
Technology, global warming and population are advancing faster than the human psych can kept up with — overflow.
Freedom and democracy give no cover to failure. Trump says don’t worry about it. It was those other folks fault. Trust me I will make it all better for you whom the government has screwed.