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The history of the United States is rich with examples of once-dominant groups adjusting to the rise of formerly marginalized populations—sometimes gracefully, more often bitterly, and occasionally violently. Partisan coalitions in the United States are constantly reshuffling, realigning along new axes. Once-rigid boundaries of faith, ethnicity, and class often prove malleable. Issues gain salience or fade into irrelevance; yesterday’s rivals become tomorrow’s allies.

But sometimes, that process of realignment breaks down. Instead of reaching out and inviting new allies into its coalition, the political right hardens, turning against the democratic processes it fears will subsume it. A conservatism defined by ideas can hold its own against progressivism, winning converts to its principles and evolving with each generation. A conservatism defined by identity reduces the complex calculus of politics to a simple arithmetic question—and at some point, the numbers no longer add up.

Trump has led his party to this dead end, and it may well cost him his chance for reelection, presuming he is not removed through impeachment. But the president’s defeat would likely only deepen the despair that fueled his rise, confirming his supporters’ fear that the demographic tide has turned against them. That fear is the single greatest threat facing American democracy, the force that is already battering down precedents, leveling norms, and demolishing guardrails. When a group that has traditionally exercised power comes to believe that its eclipse is inevitable, and that the destruction of all it holds dear will follow, it will fight to preserve what it has—whatever the cost.

Adam Przeworski, a political scientist who has studied struggling democracies in Eastern Europe and Latin America, has argued that to survive, democratic institutions “must give all the relevant political forces a chance to win from time to time in the competition of interests and values.” But, he adds, they also have to do something else, of equal importance: “They must make even losing under democracy more attractive than a future under non-democratic outcomes.” That conservatives—despite currently holding the White House, the Senate, and many state governments—are losing faith in their ability to win elections in the future bodes ill for the smooth functioning of American democracy. That they believe these electoral losses would lead to their destruction is even more worrying.

We should be careful about overstating the dangers. It is not 1860 again in the United States—it is not even 1850. But numerous examples from American history—most notably the antebellum South—offer a cautionary tale about how quickly a robust democracy can weaken when a large section of the population becomes convinced that it cannot continue to win elections, and also that it cannot afford to lose them.