For scholars of American political history, the 2016 election was a moment of methodological reassessment. After Donald Trump eviscerated his seemingly “respectable” GOP challengers in the Republican presidential primary and went on to win the general election, historians and theorists of the American Right rethought the reigning “ostracization thesis,” a memorable phrase Edward H. Miller uses to describe a historiographical narrative grounded in the theory that American conservatives, led by Ronald Reagan, had prevailed in the 1980s by systematically purging their movement of extremists in the 1960s and 1970s (258). In 2017, Rick Perlstein, one of the most celebrated popular historians of the conservative movement, published an essay in the New York Times memorably titled “I Thought I Understood the American Right. Trump Proved Me Wrong.” In it, he expressed regret for helping to forge this narrative in his first book, Before the Storm: Barry Goldwater and the Unmaking of the American Consensus (Hill and Wang, 2001). Cory Robin updated his influential book The Reactionary Mind (Oxford University Press, 2011; 2018) to account for Trump's ascendance. “Like most observers of American politics,” Robin wrote in the preface to the second edition, “I was shocked by Trump's victory in the 2016 presidential election.” But if the 2016 election prompted a critical reassessment, then the 2020 election and its chaotic coda (i.e., the attack on the US Capitol on January 6, 2021) prompted a scholarly reckoning not only with modern American conservatism, but also with the broader narrative arc of twentieth-century American politics. The four recent books under review here, which were all published after the 2020 election, represent some of the first revisionist fruits of this reckoning.