bˈɪldɪŋ ɔnðə dˈeɪɾə ɐbˌaʊt kˈɪnʃɪp ænd sˈoʊʃəl ˌɔːɹɡɐnᵻzˈeɪʃən pɹɪzˈɛntᵻd ɪn hɪz wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɛvənti wˈʌn sˈɪstəmz ʌv kɑːnsɐŋɡwˈɪnᵻɾi ænd ɐfˈɪnᵻɾi ʌvðə hjˈuːmən fˈæmɪli, mˈɔːɹɡən dɪvˈɛləps hɪz θˈiəɹi ʌvðə θɹˈiː stˈeɪdʒᵻz ʌv hjˈuːmən pɹˈɑːɡɹɛs, ˈaɪ.ˈiː., fɹʌm sˈævɪdʒɹi θɹuː bˈɑːɹbɑːɹɹˌɪzəm tə sˌɪvɪlᵻzˈeɪʃən.
Building on the data about kinship and social organization presented in his 1871 Systems of Consanguinity and Affinity of the Human Family, Morgan develops his theory of the three stages of human progress, i.e., from Savagery through Barbarism to Civilization.