The United States is nine days away from a portentous presidential election that, however it turns out, promises to leave around half the nation believing that catastrophe has been narrowly averted and the rest believing that all is lost. Desperate hopes and apocalyptic fears suffuse the electorate. Significant swathes of the right and left – especially among the intellectual class – believe that the other side is dishonest, wicked, and bent on overthrowing democracy in America. This tendency to loathe those in the rival political camp presents an overriding threat to the nation.

To endure, a rights-protecting or liberal democracy needs citizens who regard themselves as engaged in a common enterprise. They must share a language. They must respect basic moral and political principles. They must take pride in their nation’s accomplishments while facing up to and correcting their country’s flaws by upholding the best in the nation’s traditions and heeding justice’s enduring imperatives. They must trust that as they generally follow society’s written and unwritten rules, so too will others. And they must partake of a broad commitment – that receives expression in the exercise of toleration and civility – to securing a freedom for each consistent with a like freedom for all. Otherwise, democracy will dissolve into authoritarianism as citizens lose the ability to cooperate in nurturing their communities, maintaining a prosperous economy, and protecting their equal rights.

Seeing themselves as engaged in a common enterprise can be a challenge for citizens of a rights-protecting democracy. That’s because rights and democracy encourage individuals – and the groups to which they belong – to go their own ways. Endowed with differing abilities and dispositions, free citizens develop distinctive interests, hold a diversity of opinions, and pursue happiness in their own manner.

To preserve unity within this diversity, rights-protecting democracies must educate citizens about their common enterprise. That common enterprise consists in large measure, citizens must learn, in maintaining a political order that enables individuals and families – and the associations they form – to disagree peacefully and even productively not only about ordinary public policy but also about ultimate questions concerning moral excellence and the path to salvation.

A rising challenge to America’s common enterprise stems from adamant calls to discard the Constitution. The formal crystallization of the country’s dedication to equal liberty under law, the Constitution – its premises, operations, and goals – is permanently open to discussion. But instead of arguing about the interpretation of this or that constitutional provision and rather than debating schools of........

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