It's happening everywhere, but as usual America is the biggest, brashest example of it. It's partly the last rally cry of a dying generation, and the blow back of 20 odds years of relative liberalism. Basically, people who feel left behind by the modern world, and would rather see it burn than adapt.
History is a continual case of "one step forward, two steps back"...My parents thought the 60s would usher in a century of unadulterated liberalism, but instead they got Reagan & Thatcher before the 70s were out.
Which isn't to say we can just wait this out. Brexit was such a shitter because we didn't expect it, which is partly how we allowed it happen. So whenever I see people joking about their pro-Trump friends, parents and relatives, and how they aren't worth engaging, it exasperates me. Anyone close to a Trump supporter should take it as a duty to challenge them, even if it is futile. Beg them, plead with them, suck their fecking dicks! We're talking about Donald Trump becoming the most powerful man in the world, this isn't a trivial matter.