But the fixation on diversity in our schools and in the press has produced a generation of liberals and progressives narcissistically unaware of conditions outside their self-defined groups, and indifferent to the task of reaching out to Americans in every walk of life. At a very young age our children are being encouraged to talk about their individual identities, even before they have them. By the time they reach college many assume that diversity discourse exhausts political discourse, and have shockingly little to say about such perennial questions as class, war, the economy and the common good.

It is a truism that America has become a more diverse country. It is also a beautiful thing to watch. Visitors from other countries, particularly those having trouble incorporating different ethnic groups and faiths, are amazed that we manage to pull it off. Not perfectly, of course, but certainly better than any European or Asian nation today. It’s an extraordinary success story.

But how should this diversity shape our politics? The standard liberal answer for nearly a generation now has been that we should become aware of and “celebrate” our differences. Which is a splendid principle of moral pedagogy — but disastrous as a foundation for democratic politics in our ideological age. In recent years American liberalism has slipped into a kind of moral panic about racial, gender and sexual identity that has distorted liberalism’s message and prevented it from becoming a unifying force capable of governing.

One of the many lessons of the recent presidential election campaign and its repugnant outcome is that the age of identity liberalism must be brought to an end. Hillary Clinton was at her best and most uplifting when she spoke about American interests in world affairs and how they relate to our understanding of democracy. But when it came to life at home, she tended on the campaign trail to lose that large vision and slip into the rhetoric of diversity, calling out explicitly to African-American, Latino, L.G.B.T. and women voters at every stop. This was a strategic mistake. If you are going to mention groups in America, you had better mention all of them. If you don’t, those left out will notice and feel excluded. Which, as the data show, was exactly what happened with the white working class and those with strong religious convictions. Fully two-thirds of white voters without college degrees voted for Donald Trump, as did over 80 percent of white evangelicals.

The moral energy surrounding identity has, of course, had many good effects. Affirmative action has reshaped and improved corporate life. Black Lives Matter has delivered a wake-up call to every American with a conscience. Hollywood’s efforts to normalize homosexuality in our popular culture helped to normalize it in American families and public life.

But the fixation on diversity in our schools and in the press has produced a generation of liberals and progressives narcissistically unaware of conditions outside their self-defined groups, and indifferent to the task of reaching out to Americans in every walk of life. At a very young age our children are being encouraged to talk about their individual identities, even before they have them. By the time they reach college many assume that diversity discourse exhausts political discourse, and have shockingly little to say about such perennial questions as class, war, the economy and the common good. In large part this is because of high school history curriculums, which anachronistically project the identity politics of today back onto the past, creating a distorted picture of the major forces and individuals that shaped our country. (The achievements of women’s rights movements, for instance, were real and important, but you cannot understand them if you do not first understand the founding fathers’ achievement in establishing a system of government based on the guarantee of rights.)

When young people arrive at college they are encouraged to keep this focus on themselves by student groups, faculty members and also administrators whose full-time job is to deal with — and heighten the significance of — “diversity issues.” Fox News and other conservative media outlets make great sport of mocking the “campus craziness” that surrounds such issues, and more often than not they are right to. Which only plays into the hands of populist demagogues who want to delegitimize learning in the eyes of those who have never set foot on a campus. How to explain to the average voter the supposed moral urgency of giving college students the right to choose the designated gender pronouns to be used when addressing them? How not to laugh along with those voters at the story of a University of Michigan prankster who wrote in “His Majesty”?

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