Unilineal evolution
Progressivism

Both Spencer and Comte view the society as a kind of organism subject to the process of growth—from simplicity to complexity, from chaos to order, from generalization to specialization, from flexibility to organization. They agreed that the process of societies growth can be divided into certain stages, have their beginning and eventual end, and that this growth is in fact social progress—each newer, more evolved society is better. Thus progressivism became one of the basic ideas underlying the theory of social evolutionism.
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