When a Manhattan jury found Donald J. Trump guilty, it should have sent shock waves through the nation. Yet, though the trial and conviction of a former president was unprecedented in American history, it seems most people couldn’t have cared less. As Michelle Goldberg recently noted, only 16 percent of respondents to a Yahoo News/YouGov poll said they had followed the first few weeks of the trial very closely, and when asked how they felt, many replied, “bored.”

In its way, that must have annoyed Mr. Trump: how insulting, that no one would care. There was media coverage, but no frenzy, no rallies around the world in protest when he was convicted. But to win in the court of public opinion, Mr. Trump must now transform a trial in a run-down Manhattan courtroom from a shoulder shrug into an unforgettable event, with a story powerful enough to keep his supporters energized, if not outraged, and to drum up sympathy from the undecideds.

For months, Mr. Trump has been laying the groundwork, spinning his tale of tyranny and martyrdom (his own of course) and styling himself as the victim of an administration that has to play dirty to eliminate a rival as formidable as he. That story of persecution has only grown louder in recent days. Moments after hearing the jury pronounce him guilty, he predictably called the trial “rigged,” the judge “conflicted,” and a trial by jury as well as government institutions like the justice system irrelevant compared with the verdict that galvanized voters will presumably hand him in November. Politics, not the law, is his métier, and history is not his concern. His preoccupation, and his talent, is storytelling.

Instinctively he grasps the kind of broader stories that break through from the courtroom to the public. These stories fueled what pundits, particularly in the 20th century, frequently dubbed the “trial of the century” — trials that captured the hearts and minds of the public, that sold newspapers, and that would grip the whole nation, if not the world, with their cultural significance. Each of these trials riveted the country by bringing to the foreground moral values and failings that affected all Americans.

Take the Scopes monkey trial in Tennessee in 1925, about a new law that barred the theory of evolution from being taught in public schools, which became a showdown between a three-time presidential candidate, the eloquent politician William Jennings Bryan, and the famous defense lawyer Clarence Darrow. Covered day after day on the front page of newspapers coast to coast, it even found its way into Hemingway’s novel “The Sun Also Rises.” The issue here was faith and reason, or what passes for both, and whether government could mandate belief. A young high school teacher, John Scopes, purposefully broke the recently passed law “to show,” as the brilliant attorney Arthur Garfield Hays argued, “that such laws result in hate and intolerance, that they are conceived in bigotry and born in ignorance — ignorance of the Bible, of religion, of history, and of science.”

There was the trial of the anarchists Nicola Sacco and Bartolomeo Vanzetti, two Italian immigrants accused of robbery and murder in Massachusetts, which caused such international indignation that rallies against their execution were held from London to Johannesburg. Edna St. Vincent Millay published a poem titled “Justice Denied in Massachusetts” in The New York Times to protest the handling of the Sacco and Vanzetti trial, and Felix Frankfurter called the misrepresentations, suppressions and misquotations of its presiding judge disgraceful.