If your reaction to the January 6, 2021, insurrection at the Capitol was to think, 'That's not us,' think again: in Illiberal America, a Pulitzer Prize-winning historian uncovers a powerful illiberalism as deep seated in the American past as the founding ideals. Driven by popular movements and implemented through courts and legislation, illiberalism is part of the American bedrock. The United States was born a republic of loosely connected states and localities that demanded control of their domestic institutions, including slavery. As white settlement expanded west and immigration exploded in eastern cities, the democracy of the 1830s fueled expulsions of Blacks, Native Americans, Catholics, Mormons, and abolitionists. After the Civil War, southern states denied new constitutional guarantees of civil rights and enforced racial exclusions in everyday life. Illiberalism was modernized during the Progressive movement through advocates of eugenics who aimed to reduce the numbers of racial and ethnic minorities. The turmoil of the 1960s enabled George Wallace to tap local fears of unrest and build support outside the South, a politics adopted by Richard Nixon in 1968. Today, with illiberalism shaping elections and policy debates over guns, education, and abortion, it is urgent to understand its long history, and how that history bears on the present crisis.