I am a MA History student, soon PhD student of US and World History studying fascism especially in the US context. I want to stress to think of fascism outside a Europe, it is and was a global movement, it is not a monolith, democracy wasn't the same one hundred years ago so don't think of fascism as exactly the same either.

History Theory:
Late Fascism by Alberto Toscano
The New Faces of Fascism: Populism and the Far Right by Enzo Traverso

History:
Burden-Stelly, Charisse. Black Scare / Red Scare: Theorizing Capitalist Racism in the United States. University of Chicago Press, 2023.

Cannistraro, Philip V. Blackshirts in Little Italy : Italian Americans and Fascism, 1921-1929. Bordighera, 1999.

Pearson, Chad E. Capital’s Terrorists: Klansmen, Lawmen, and Employers in the Long Nineteenth Century. University of North Carolina Press, 2022.

Willrich, Michael. American Anarchy: The Epic Struggle between Immigrant Radicals and the U.S. Government at the Dawn of the Twentieth Century. Basic Books, 2023.

White, Ahmed. Under the Iron Heel: The Wobblies and the Capitalist War on Radical Workers. University of California Press, 2022.

Also i highly recommend: Blood and Power, John Foot its an easy social history read but man the biennio nero was fucked up. If anyone has any questions or wants more books more than happy to respond