2020 Isabel Wilkerson book that inspired Ava DuVernay's 2023 film "Origin" (5)

I believe the answer is:

caste

(Other definitions for caste that I've seen before include "Social station" , "Social class in Hinduism" , "Social class in India" , "Social division in Hinduism" , "Hereditary social class among Hindus" .)

I've seen this clue in The Washington Post.

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