Why were unilinear theories of cultural evolution criticized as racist?

Unilinear theories of cultural evolution were criticized as racist because they established a hierarchical framework that ranked human societies on a single, fixed path of progress, with Western industrial civilizations positioned at the "pinnacle" of human achievement.1

These theories, which gained prominence in the 18th and 19th centuries, posited that all societies evolved through identical stages—often labeled as savagery, barbarism, and civilization. By characterizing non-Western, indigenous, or hunter-gatherer cultures as "primitive" or "laggards" that represented earlier stages of human development, these models inherently devalued diverse cultural histories.21

This perspective was frequently used to justify imperialist, colonialist, and racist policies by framing the dominance of Western powers as the natural, inevitable outcome of superior evolution. Scholars like Franz Boas later challenged these views, arguing that such evolutionary schemes were ethnocentric and that cultural differences resulted from specific historical and environmental circumstances rather than an inherent, universal ladder of progress.341