The soldiers, millions of them, came home from the war. They dispersed across the country, in big towns and small. It was not easy to recount what had happened to them, and for the dead it was impossible.

Something in the nature of their sacrifice was unsayable. The country was not especially interested. War had not brought the nation together but had divided it. The sudden flash, the boom, the acrid stench and utter randomness of death were as haunting as they were incommunicable.

This was war without victory, the kind that invites silence. For the soldiers, who fought in the belief that their cause was right and their nation just, the silence was humiliating. They bore their injuries, visible and invisible, with stoicism.

Resentments accumulated. The years went by, bringing only mediocrity. Glory and victory were forgotten words. Perhaps someone might mutter, “Thank you for your service.” That was it. There was no national memorial, for what would be memorialized?Savings evaporated overnight in an economic meltdown engineered by financiers and facilitated by the abolishers of risk.

Democracy, the great diluter, slow and compromised, was inadequate for the expression of the soldiers’ emotions. Reasonable leaders with rational arguments could not assuage the loss. They seemed to belittle it with their parsing of every question and their half-decisions.

No, what was needed was a leader with answers, somebody to marshal a popular movement and cut through hesitations, a strongman who would put the nation first and mythologize its greatness, a figure ready to scapegoat without mercy, a unifier giving voice to the trampled masses, a man who could use democracy without being its slave.

Over 15 years national embitterment festered and yearning intensified. But which 15 years? Anyone these days may be forgiven for moments of disorientation. The 15 years from the devastating German defeat of 1918 to the electoral victory (with 43.9 percent of the vote) of Adolf Hitler in 1933? Or the 15 years from the devastating 9/11 attack on the United States to the electoral victory (with 46.1 percent of the vote) of Donald Trump in 2016?National humiliation is long in gestation and violent in resolution.

German soldiers, two million of them killed in the Great War, came home to fractious and uneasy democratic politics, the ignominy of reparations, the hyperinflation of the early 1920s, the crash of 1929, and the paralysis of a political system held hostage by the extremes of left and right.

Some 2.7 million American soldiers came home to a country that had been shopping while they served in the Afghan and Iraqi wars, with 6,893 killed and more than 52,000 injured. They returned to an increasingly dysfunctional and polarized polity; to the financial disaster of 2008; to the mystery of what the spending of trillions of dollars in those wars had achieved; to stagnant incomes; to the steady diminishment of American uniqueness and the apparent erosion of its power.

Every American should look at the map in Kael Weston’s powerful book, “The Mirror Test.” It shows, with dots, the hometowns of U.S. service members killed in Iraq and Afghanistan. No state is spared. The map should be hung in classrooms across the country.

I have tried to tread carefully with analogies between the Fascist ideologies of 1930s Europe and Trump. American democracy is resilient. But the first days of the Trump presidency — whose roots of course lie in far more than the American military debacles since 9/11 — pushed me over the top. The president is playing with fire.

To say, as he did, that the elected representatives of American democracy are worthless and that the people are everything is to lay the foundations of totalitarianism. It is to say that democratic institutions are irrelevant and all that counts is the great leader and the masses he arouses. To speak of “American carnage” is to deploy the dangerous lexicon of blood, soil and nation. To boast of “a historic movement, the likes of the which the world has never seen before” is to demonstrate consuming megalomania. To declaim “America first” and again, “America first,” is to recall the darkest clarion calls of nationalist dictators. To exalt protectionism is to risk a return to a world of barriers and confrontation. To utter falsehood after falsehood, directly or through a spokesman, is to foster the disorientation that makes crowds susceptible to the delusions of strongmen.

Trump’s outrageous claims have a purpose: to destroy rational thought. When Primo Levi arrived at Auschwitz he reached, in his thirst, for an icicle outside his window but a guard snatched it away. “Warum?” Levi asked (why?). To which the guard responded, “Hier ist kein warum” (here there is no why).

As the great historian Fritz Stern observed, “This denial of ‘why’ was the authentic expression of all totalitarianism, revealing its deepest meaning, a negation of Western civilization.”Americans are going to have to fight for their civilization and the right to ask why against the banal belligerence of Trump.

<ROGER COHEN>