American political history, it would seem, is everywhere. Hardly a day passes without some columnist comparing Donald J. Trump to Huey Long, Father Coughlin or George Wallace. “All the Way,” a play about Lyndon B. Johnson, won a slew of awards and was turned into an HBO film.

But the public’s love for political stories belies a crisis in the profession. American political history as a field of study has cratered. Fewer scholars build careers on studying the political process, in part because few universities make space for them. Fewer courses are available, and fewer students are exposed to it. What was once a central part of the historical profession, a vital part of this country’s continuing democratic discussion, is disappearing.

This wasn’t always the case. Political history — a specialization in elections and elected officials, policy and policy making, parties and party politics — was once a dominant, if not the dominant, pursuit of American historians. Many of them, in turn, made vital contributions to the political process itself, whether it was Arthur Schlesinger Jr.’s role in the Kennedy White House or C. Vann Woodward’s “The Strange Career of Jim Crow,” which the Rev. Dr. Martin Luther King Jr. called the “bible of the civil rights movement.”

But somewhere along the way, such work fell out of favor with history departments. According to the American Historical Association’s listing of academic departments, three-quarters of colleges and universities now lack full-time researchers and teachers in the subject.