Eugenics was a popular movement in many countries. In the United States, different forms of eugenics were supported by professional biologists and broad swaths of the American public from a range of political, religious, and ideological perspectives. Historians have drawn on a range of factors to explain the movement’s pervasive influence:
When Charles Darwin published his theory of evolution in 1859, he included just one sentence on human beings: ‘Light will be thrown on the origin of man and his history.’ Twelve years later, in The Descent of Man, he wrote that ‘civilised’ societies’ protection of the ‘weak’ was probably injurious to progress. But Darwin also wrote that he did not believe humanity could withhold sympathy for the ‘weak’ – even at the ‘urging of hard reason’ – without ‘deterioration in the noblest parts of our nature.’ As anti-evolutionist William Jennings Bryan later wrote, Darwin’s followers ‘were more hardened.’
Charles Darwin’s cousin Francis Galton coined the term eugenics in 1883 in a footnote on p. 17 of his book Inquiries into Human Faculty and its Development. Galton also coined the phrase ‘Nature versus Nurture’ when acknowledging the difficulty of distinguishing between hereditary versus environmental influences on traits. His acknowledgement of that difficulty did not always result in caution in drawing conclusions. Galton argued, for example, that the fact men dominated lists of the most important works in literature, music, philosophy, etc., proved that men are naturally superior in intellect to women. Pervasive cultural norms influenced Galton’s conclusions about what Nature was like, including the origin of human difference and variation.
After the rediscovery of Mendel’s work in 1900 (it originally appeared in the 1860s) biologists quickly adopted his theory of heredity as a means of explaining the origin of individuals’ behavioral and moral tendencies. Here Princeton Professor of Biology Edwin Grant Conklin describes a range of traits as dominant or recessive. Conklin’s textbook, originally published in 1915 by Princeton University Press, was reprinted several times. This edition is from 1920. In a section entitled ‘Control of Heredity: Eugenics’ Conklin wrote: ‘The worst types of mankind may be prevented from propagating, and the best types may be encouraged to increase and multiply. This is apparently the only way in which we may hope to improve permanently the human breed.’ (p. 276).
Harvard-trained biologist Charles B. Davenport, who later served as the director of the Eugenics Records Office, co-authored this report for the War Department (under the direction of The Surgeon General, M.W. Ireland) in 1920. The results were often cited within eugenic literature as evidence of the national, racial degeneration of the U.S. male population. The authors spoke of ‘constitutional (i.e. hereditary) limitations of the various races’ and described human beings as ‘breeding stock.’