Eugenics contributing factor of compulsory sterilization
History
Origin and development
Types of eugenic practices have existed for millennia. Some  indigenous peoples of Brazil are known to have practiced infanticide against children born with physical abnormalities since  precolonial times. In ancient Greece, the philosopher Plato suggested  selective mating to produce a "guardian" class. In Sparta, every Spartan child was inspected by the council of elders, the Gerousia, who determined whether or not the child was fit to live.The geographer Strabo (c. 64 BCE - c. 24 CE) states that the Samnites would take ten virgin women and ten young men who were considered to be the best representation of their sex and mate them. Following this, the best women would be given to the best male, then the second-best women to the second-best male. It is possible that the "best" men and women were chosen based on  athletic capabilities. This would continue until all 20 people had been assigned to one another. Any selected male dishonoring himself, would be separated from his partner.
In the early years of the Roman Republic, a Roman father was  obliged by law to immediately kill any "dreadfully deformed" child. According to Tacitus (c. 56 - c. 120), a Roman of the  Imperial Period, the  Germanic tribes of his day killed any member of their community they deemed cowardly, unwarlike or "stained with abominable vices", usually by drowning them in swamps. Modern historians, however, see Tacitus' ethnographic writing as unreliable in such details.The idea of a modern project for improving the human population through selective breeding was originally developed by Francis Galton (1822-1911), and was initially inspired by Darwinism and its theory of natural selection. Galton had read his half-cousin Charles Darwin's theory of evolution, which sought to explain the development of plant and animal species, and desired to apply it to humans. Based on his biographical studies, Galton believed that desirable human qualities were  hereditary traits, although Darwin strongly disagreed with this elaboration of his theory. In 1883, one year after Darwin's death, Galton gave his research a name: eugenics. With the introduction of genetics, eugenics became associated with genetic determinism, the belief that human character is entirely or in the majority caused by genes, unaffected by education or living conditions. Many of the early geneticists were not Darwinians, and evolution theory was not needed for eugenics policies based on genetic determinism. Throughout its recent history, eugenics has remained controversial.Eugenics became an academic discipline at many colleges and universities and received funding from many sources. Organizations were formed to win public support for and to sway opinion towards responsible eugenic values in parenthood, including the British Eugenics Education Society of 1907 and the  American Eugenics Society of 1921. Both sought support from leading clergymen and modified their message to meet religious ideals. In 1909, the Anglican clergymen William Inge and James Peile both wrote for the Eugenics Education Society. Inge was an invited speaker at the 1921 International Eugenics Conference, which was also endorsed by the Roman Catholic Archbishop of New York Patrick Joseph Hayes. The book The Passing of the Great Race (Or, The Racial Basis of European History) by American eugenicist, lawyer, and amateur anthropologist Madison Grant was published in 1916. Although subsequently influential, the book was largely ignored when it first appeared, and it went through several revisions and editions. Nevertheless, the book was used by people who advocated restricted immigration as justification for what became known as "scientific racism".Three International Eugenics Conferences presented a global venue for eugenicists, with meetings in 1912 in London, and in 1921 and 1932 in New York City.  Eugenic policies in the United States were first implemented by state-level legislators in the early 1900s. Eugenic policies also took root in France, Germany, and Great Britain. Later, in the 1920s and 1930s, the eugenic policy of sterilizing certain mental patients was implemented in other countries including Belgium, Brazil,  Canada,  Japan and  Sweden. Frederick Osborn's 1937 journal article "Development of a Eugenic Philosophy" framed eugenics as a social philosophy—a philosophy with implications for social order. That definition is not universally accepted. Osborn advocated for higher rates of sexual reproduction among people with desired traits ("positive eugenics") or reduced rates of sexual reproduction or sterilization of people with less-desired or undesired traits ("negative eugenics").
In addition to being practiced in a number of countries, eugenics was internationally organized through the International Federation of Eugenics Organizations. Its scientific aspects were carried on through research bodies such as the Kaiser Wilhelm Institute of Anthropology, Human Heredity, and Eugenics, the Cold Spring Harbor Carnegie Institution for Experimental Evolution, and the Eugenics Record Office. Politically, the movement advocated measures such as sterilization laws. In its moral dimension, eugenics rejected the doctrine that all human beings are born equal and redefined moral worth purely in terms of genetic fitness. Its racist elements included pursuit of a pure "Nordic race" or "Aryan" genetic pool and the eventual elimination of "unfit" races. Many leading British politicians subscribed to the theories of eugenics. Winston Churchill supported the British Eugenics Society and was an honorary vice president for the organization. Churchill believed that eugenics could solve "race deterioration" and reduce crime and poverty.Early critics of the philosophy of eugenics included the American sociologist Lester Frank Ward, the English writer G. K. Chesterton, the German-American anthropologist Franz Boas, who argued that advocates of eugenics greatly over-estimate the influence of biology, and Scottish tuberculosis pioneer and author Halliday Sutherland. Ward's 1913 article "Eugenics, Euthenics, and Eudemics", Chesterton's 1917 book  Eugenics and Other Evils, and Boas' 1916 article "Eugenics" (published in The Scientific Monthly) were all harshly critical of the rapidly growing movement. Sutherland identified eugenicists as a major obstacle to the eradication and cure of tuberculosis in his 1917 address "Consumption: Its Cause and Cure", and criticism of eugenicists and Neo-Malthusians in his 1921 book Birth Control led to a writ for libel from the eugenicist Marie Stopes. Several biologists were also antagonistic to the eugenics movement, including Lancelot Hogben. Other biologists such as J. B. S. Haldane and R. A. Fisher expressed skepticism in the belief that sterilization of "defectives" would lead to the disappearance of undesirable genetic traits.Among institutions, the Catholic Church was an opponent of state-enforced sterilizations, but accepted isolating people with hereditary diseases so as not to let them reproduce. Attempts by the Eugenics Education Society to persuade the British government to legalize voluntary sterilization were opposed by Catholics and by the Labour Party. The American Eugenics Society initially gained some Catholic supporters, but Catholic support declined following the 1930 papal encyclical Casti connubii. In this, Pope Pius XI explicitly condemned sterilization laws: "Public magistrates have no direct power over the bodies of their subjects; therefore, where no crime has taken place and there is no cause present for grave punishment, they can never directly harm, or tamper with the integrity of the body, either for the reasons of eugenics or for any other reason."As a social movement, eugenics reached its greatest popularity in the early decades of the 20th century, when it was practiced around the world and promoted by governments, institutions, and influential individuals (such as the playwright G. B. Shaw). Many countries enacted various eugenics policies, including: genetic screenings, birth control, promoting differential birth rates, marriage restrictions, segregation (both racial segregation and sequestering the mentally ill), compulsory sterilization, forced abortions or forced pregnancies, ultimately culminating in genocide. By 2014, gene selection (rather than "people selection") was made possible through advances in genome editing, leading to what is sometimes called new eugenics, also known as "neo-eugenics", "consumer eugenics", or "liberal eugenics"; which focuses on individual freedom and allegedly pull away from racism, sexism, heterosexism or a focus on intelligence.