As democracy in the United States spirals into a widening gyre of distrust, demagogy and violence, a question has been loosed in minds across America: How does this all end? The historical analogies seem bleak. Germany’s interwar political dysfunction looms largest because of its descent into fascism. Yet there is a more hopeful example, overlooked though much closer at hand: the United States of a century ago.

At the outset of the 1920s, a wave of attempted assassinations and political violence crested alongside new barriers to immigration, a campaign of deportations and a government crackdown on dissenting speech. America was fresh off a pandemic in which divisive public health measures yielded widespread anger and distrust. Staggering levels of economic inequality underlaid a fast-chan

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