Masked officers conduct immigration raids. National Guard troops patrol American cities, and protesters decry their presence as a “fascist takeover.” White supremacists openly proclaim racist and antisemitic views.

Is the United States sliding into fascism? It’s a question that divides a good portion of the country today.

Embracing a belief in American exceptionalism – the idea that America is a unique and morally superior country – some historians suggest that “it can’t happen here,” echoing the satirical title of Sinclair Lewis’ 1935 book about creeping fascism in America. The social conditions required for fascism to take root do not exist in the U.S., these historians say.

Still, while fascist ideas never found a foothold among the majority of Americans, they exerted considerable influence during the period between the first and second world wars. Extremist groups like the Silver Shirts, the Christian Front, the Black Legion and the Ku Klux Klan claimed........

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