Trump is not alone. There is a global movement of minds. As John Lanchester has observed in The London Review of Books, “I don’t think there’s ever been a time in British politics when so many people in public life spent so much time loudly declaring things they knew not to be true.” The successful arguments of the “Leave” campaign for Britain to quit the European Union “were based on lies.” The charlatan trafficking most vociferously in these untruths, boorish Boris Johnson, has just become Britain’s foreign secretary.

Facts are now a quaint hangover from a time of rational discourse, little annoyances easily upended. Volume trumps reality, as Roger Ailes understood at Fox News, before a downfall that coincided with the apotheosis of his post-factual world.

A red-faced bully, adept in the choreography of collective hysteria, arises. He promises that he alone can set things right. He is the voice. He stands against a great tide of menace, from ISIS to immigrants, and only he understands the vast dimensions of the danger.

We have been here before. Fascism was a backlash against dysfunctional democracies. It invited belief in the leadership of the strongman against enemies within and without. Its currency was untruth and its culmination bloody unreason. It was decried and dismissed by those it would devour.

It is inevitable, given what he represents, that Trump looks to Putin. Orwell again: “Totalitarianism demands, in fact, the continuous alteration of the past, and in the long run probably demands a disbelief in the very existence of objective truth.”

Putin is not a totalitarian, but he has totalitarianism in him, and the conditions of today are not those of the 1930s. But in technology’s disorienting cacophony, the disaggregation of increasingly unequal societies, the frustrations of the many millions for whom life has become an exercise in precariousness, the pressures of globalization and mass migration, the stirring of racism, the spread of terrorism, and the steady undermining of truth, the seeds of a new authoritarianism have been sown. This is the wave Trump rides.

Trump’s strongest argument is that he represents change and Hillary Clinton does not. He will see Clinton’s charges of mendacity with accusations that she is untrustworthy. He may well win. Anyone denying this has not grasped that “epidemic suggestion” tends to be unstoppable.

Brexit illustrated a thirst for disruption at any cost. It was the supporting act for a possible American leap in the dark that would place Trump’s portrait in United States embassies around the world. Perhaps that’s the least of it. Still. That face so displayed would signal the end of an era and imminent danger to the Republic and the world.