Book excerpt: Buy now to get the main key ideas from David Corn's American Psychosis American Psychosis (2022) is a comprehensive account of the evolution of the Republican Party in the United States, tracing its journey from its origins as an anti-slavery movement to its contemporary association with radical conservatism. Political journalist David Corn explores how the party has historically capitalized on paranoia, bigotry, and conspiracy theories, culminating in the violent attack on the Capitol on January 6, 2021. He highlights the influence of extremist groups like the John Birch Society and the Tea Party and the impact of divisive figures like Senator Joe McCarthy, Ronald Reagan, and Donald Trump.