How can a country be captured by rumours, surreal conspiracy theories and the most brazen of conmen? The historian Richard Hofstadter asked these questions in the 1960s, amid fears of rising extremism in America. Yet his dazzling dissection of the paranoid worldview – a brew of overheated exaggeration, suspicion and perceived victimhood, which can derail entire nations – is a lesson for the ages in the seductive politics of the irrational.

In an era where we feel assailed by endless paranoid public statements, Hofstadter’s discussion of famous and obscure untruths, some of which have profoundly impacted American domestic and foreign policy, provide the antidote for the present day.