Back to the reason why people support Trump (which I don't , by the way), I think that a lot of people are just fed up , just as a lot of those who support Brexit are fed up with the way things are in this country, and they want drastic change. For the same reasons, Jeremy Corbyn has lots of support, so does Nigel Farage, Marine Le Pen, and others.
I think people are fed up with "middle of the road" politicians who don't make drastic changes.
Some people don't like the fact that we have lots of immigrants.
Some bemoan the lack of jobs, because a lot of our unskilled and manufacturing jobs have gone. I remember when one could leave school at age 15 or 16, go into a job for life, and work one's way up. Not so easy any more.
Some are angry because they can't afford to buy a home.
Some are sick to death of the NHS getting worse and worse, etc.
I find it odd that we live in one of the richest countries in the world, yet we are always being told that the government has no money, that councils have no money, etc. I think all the trouble started in the 1980s, when they started privatising everything. A few people now have money, most people don't, and they are reliant on the "state".
I don't know what it is like in the US, but , if it is like here, then I am not that surprised that people voted for Trump. They think he will change things, not just talk about it. Personally, I think he is bad news. I didn't want Brexit either, but still----------