Definition
Racial caste is the framing — most fully developed in Isabel Wilkerson's Caste: The Origins of Our Discontents (2020) and prefigured in The Warmth of Other Suns (2010) — that the U.S. racial order is best understood not as "racism" (a matter of individual attitudes) but as a caste system: a hereditary hierarchy assigned at birth, presented as natural, and maintained by everyday ritual reinforcement and periodic violence.
The frame draws explicit parallels between the U.S. racial order, India's varna-and-jati caste system, and the racial ranking imposed by Nazi Germany (whose Nuremberg laws drew, by the Nazis' own acknowledgment, on U.S. segregation statutes).
Why it matters
How it works
Wilkerson identifies what she calls the "eight pillars of caste": divine or natural justification; heritability; endogamy and control of marriage; purity vs. pollution; occupational hierarchy; dehumanization and stigma; terror as enforcement; and inherent superiority vs. inferiority. The U.S. racial system, she argues, exhibits all eight. Hereditary assignment was enforced through "one-drop" rules; endogamy through antimiscegenation laws that survived into 1967; occupational hierarchy through both slavery and the Jim Crow labor market; ritual purity through separate water fountains, Bibles, and cemeteries; dehumanization through the legal classification of enslaved people as property; terror through lynching and the threat of it; and "natural" inferiority through scientific racism and biblical justification.
The everyday operation of the system is what caste analysis foregrounds. A Black Southerner in 1940 was expected to step off a sidewalk, remove a hat, address white men as "sir" and white boys with deference, and accept nominal forms of address ("boy," "auntie") that denied adult status. These were not idiosyncratic personal preferences of individual whites; they were a code, breach of which carried the risk of beating or worse. The code reinforced caste with every interaction, every day, for generations — independent of whether the individuals involved harbored conscious animus.
The framing has been criticized — some scholars argue it underplays the role of capitalism and class, or that the U.S. and Indian cases differ in important structural respects. Others argue the parallel can be deepened further. The frame is best read as a powerful interpretive lens rather than an exclusive theory: it does work that "race relations" and "prejudice" do not, by making visible the systemic, ritualized, and self-perpetuating character of racial hierarchy.
For Wilkerson's narrative purposes in The Warmth of Other Suns, racial caste explains why the Great Migration was a political act on the scale of the Russian or Chinese revolutions: six million people refusing the position they had been assigned by birth.