of Louis Agassiz and Samuel Morton, the authors spread the virulent and explicitly racist views to a wider, more popular audience. The first printing sold out quickly and by the end of the century it had undergone nine editions. Although many Southerners felt that all the justification for slavery they needed was found in the Bible, others used the new science to defend slavery and the repression of American Indians. Abolitionists, however, felt they had to take this science on its own terms. And for the first time, African American intellectuals waded into the contentious debate. In the immediate wake of Types of Mankind and during the pitched political battles that led to Civil War, Frederick Douglass (1818–1895), the statesman and persuasive abolitionist, directly attacked the leading theorists of the American School of Anthropology. In an 1854 address, entitled "The Claims of the Negro Ethnologically Considered", Douglass argued that "by making the enslaved a character fit only for slavery, [slaveowners] excuse themselves for refusing to make the slave a freeman.... For let it be once granted that the human race are of multitudinous origin, naturally different in their moral, physical, and intellectual capacities ... a chance is left for slavery, as a necessary institution.... There is no doubt that Messrs. Nott, Glidden, Morton, Smith and Agassiz were duly consulted by our slavery propagating statesmen" (p. 287). Lewis Henry Morgan in the United States Lewis Henry Morgan (1818–1881), a lawyer from Rochester, New York, became an advocate for and ethnological scholar of the Iroquois. His comparative analyses of religion, government, material culture, and especially kinship patterns proved to be influential contributions to the field of anthropology. Like other scholars of his day (such as Edward Tylor), Morgan argued that human societies could be classified into categories of cultural evolution on a scale of progression that ranged from savagery, to barbarism, to civilization. He focused on understanding how cultures integrated and systematized, and how the various features of one culture indicate an evolutionary status in comparison with other cultures. Generally, Morgan used technology (such as bowmaking or pottery) as an indicator of position on this scale. Franz Boas Franz Boas established academic anthropology in the United States in opposition to this sort of evolutionary perspective. His approach was empirical, skeptical of overgeneralizations, and eschewed attempts to establish universal laws. For example, Boas studied immigrant children to demonstrate that biological race was not