1. 19th century anthropologists like Lewis Henry Morgan and Edward Tylor proposed theories of unilinear evolutionism, which argued that all human societies evolved through the same linear stages of development, from savagery to barbarism to civilization. 2. Morgan's 1877 book "Ancient Society" divided savagery and barbarism into distinct sub-stages based on technological and cultural achievements. However, his assumptions of a single evolutionary path and criteria for stages have been criticized. 3. Tylor applied evolutionary theory to religion, proposing societies evolved from animism to polytheism to monotheism and eventually science. He and Morgan were interested in "survivals," or practices that survived into