# Eugenics

Eugenics (/juːˈdʒɛnɪks/ yoo-JEN-iks; from Ancient Greek εύ̃ (eû) 'good, well' and -γενής (genḗs) 'born, come into being, growing/grown') is a set of beliefs and practices that aim to improve the genetic quality of a human population. Historically, eugenicists have attempted to alter the frequency of various human phenotypes by inhibiting the fertility of people and groups they considered inferior, or promoting that of those considered superior.
The contemporary history of eugenics began in the late 19th century, when a popular eugenics movement emerged in the United Kingdom, and then spread to many countries, including the United States, Canada, Australia, and most European countries (e.g. Sweden and Germany). In this period, people from across the political spectrum espoused eugenic ideas. Consequently, many countries adopted eugenic policies, intended to improve the quality of their populations' genetic stock.
Historically, the idea of eugenics has been used to argue for a broad array of practices ranging from prenatal care for mothers deemed genetically desirable to the forced sterilization and murder of those deemed unfit. To population geneticists, the term has included the avoidance of inbreeding without altering allele frequencies; for example, British-Indian scientist J. B. S. Haldane wrote in 1940 that "the motor bus, by breaking up inbred village communities, was a powerful eugenic agent." Debate as to what exactly counts as eugenics continues today. Early eugenicists were mostly concerned with factors of measured intelligence that often correlated strongly with social class.
Although it originated as a progressive social movement in the 19th century, in contemporary usage in the 21st century, the term is closely associated with scientific racism. New, liberal eugenics seeks to dissociate itself from old, authoritarian eugenics by rejecting coercive state programs and relying on parental choice.

## Common distinctions

Eugenic programs included both positive measures, such as encouraging individuals deemed particularly "fit" to reproduce, and negative measures, such as marriage prohibitions and forced sterilization of people deemed unfit for reproduction.$^{:104–155}$
In other words, positive eugenics is aimed at encouraging reproduction among the genetically advantaged, for example, the eminently intelligent, the healthy, and the successful. Possible approaches include financial and political stimuli, targeted demographic analyses, in vitro fertilization, egg transplants, and cloning. Negative eugenics aimed to eliminate, through sterilization or segregation, those deemed physically, mentally, or morally "undesirable". This includes abortions, sterilization, and other methods of family planning. Both positive and negative eugenics can be coercive; in Nazi Germany, for example, abortion was illegal for women deemed by the state to be fit.

### As opposed to "euthenics"

Euthenics (/juːˈθɛnɪks/) is the study of improvement of human functioning and well-being by improvement of living conditions. "Improvement" is conducted by altering external factors such as education and the controllable environments, including environmentalism, education regarding employment, home economics, sanitation, and housing, as well as the prevention and removal of contagious disease and parasites.
In a New York Times article of May 23, 1926, Rose Field notes of the description, "the simplest [is] efficient living". It is also described as "a right to environment", commonly as dual to a "right of birth" that correspondingly falls under the purview of eugenics.
The influential historian of education Abraham Flexner questions its scientific value in stating:
   [T]he “science” is artificially pieced together of bits of mental hygiene, child guidance, nutrition, speech development and correction, family problems, wealth consumption, food preparation, household technology, and horticulture. A nursery school and a school for little children are also included. The institute is actually justified in an official publication by the profound question of a girl student who is reported as asking, “What is the connection of Shakespeare with having a baby?” The Vassar Institute of Euthenics bridges this gap!
Eugenicist Charles Benedict Davenport noted in his article "Euthenics and Eugenics," reprinted in Popular Science Monthly:
   Thus the two schools of euthenics and eugenics stand opposed, each viewing the other unkindly. Against eugenics it is urged that it is a fatalistic doctrine and deprives life of the stimulus toward effort. Against euthenics the other side urges that it demands an endless amount of money to patch up conditions in the vain effort to get greater efficiency. Which of the two doctrines is true?
   The thoughtful mind must concede that, as is so often the case where doctrines are opposed, each view is partial, incomplete and really false. The truth does not exactly lie between the doctrines; it comprehends them both.
   [...] [I]n the generations to come, the teachings and practice of euthenics [...] [may] yield greater result because of the previous practice of the principles of eugenics.
   The more rational the race becomes, the better roads, ships, tools, machines, foods, medicines and the like it will produce to aid itself, though it will need them less. The more sagacious and just and humane the original nature that is bred into man, the better schools, laws, churches, traditions and customs it will fortify itself by. There is no so certain and economical a way to improve man's environment as to improve his nature.

## Historical eugenics
### Ancient and medieval origins

According to Plutarch, in Sparta every proper citizen's child was inspected by the council of elders, the Gerousia, which determined whether or not the child was fit to live. If the child was deemed incapable of living a Spartan life, the child was usually killed in a chasm near the Taygetus mountain known as the Apothetae. Further trials intended to discern a child's fitness included bathing them in wine and exposing them to the elements to fend for themselves, with the intention of ensuring that only those considered strongest survived and procreated.
The lack of sources by contemporary Greeks mentioning Spartan eugenics and the lack of archeological evidence has brought ideas about Spartan eugenics into question. While infanticide was practiced by Greeks, no contemporary sources support Plutarch's claims of mass infanticide motivated by eugenics. In 2007 the suggestion that infants were dumped near Mount Taygete was called into question due to a lack of physical evidence. Anthropologist Theodoros Pitsios' research found only bodies from adolescence up to the age of approximately 35.
Plato's political philosophy included the belief that human reproduction should be cautiously monitored and controlled by the state. He advocated that selective breeding should be applied to both humans and animals. Plato recognized that this form of government control would not be readily accepted, and proposed the truth be concealed from the public via a fixed lottery. Mates, in Plato's Republic, would be chosen by a "marriage number" in which the quality of the individual would be quantitatively analyzed, and persons of high numbers would be allowed to procreate with other persons of high numbers. This would then lead to predictable results and the improvement of the human race. Plato acknowledged the failure of the "marriage number" since "gold soul" persons could still produce "bronze soul" children. Plato's ideas may have been one of the earliest attempts to mathematically analyze genetic inheritance, prefiguring some of what would much later become known as Mendelian genetics.
The geographer Strabo (c. 64 BCE – c. 24 CE) stated 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. Any selected male committing a dishonorable act would be separated from his partner.

### Academic origins

The term eugenics and its modern field of study were first formulated by Francis Galton in 1883, directly drawing on the recent work delineating natural selection by his half-cousin Charles Darwin. He published his observations and conclusions chiefly in his influential book Inquiries into Human Faculty and Its Development. Galton himself defined it as "the study of all agencies under human control which can improve or impair the racial quality of future generations". The first to systematically apply Darwinism theory to human relations, Galton believed that various desirable human qualities were also hereditary ones, although Darwin strongly disagreed with this elaboration of his theory.
Eugenics became an academic discipline at many colleges and universities and received funding from various 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.
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.
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. 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 pulls away from racism, sexism or a focus on intelligence.

#### Early opposition

Early critics of the philosophy of eugenics included the American sociologist Lester Frank Ward, the English writer G. K. Chesterton, 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 Franz Boas' 1916 article "Eugenics" (published in The Scientific Monthly) were all harshly critical of the rapidly growing movement.
Several biologists were also antagonistic to the eugenics movement, including Lancelot Hogben. Other biologists who were themselves eugenicists, such as J. B. S. Haldane and R. A. Fisher, however, also expressed skepticism in the belief that sterilization of "defectives" (i.e. a purely negative eugenics) 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."
In fact, more generally, "[m]uch of the opposition to eugenics during that era, at least in Europe, came from the right."$^{:36}$ The eugenicists' political successes in Germany and Scandinavia were not at all matched in such countries as Poland and Czechoslovakia, even though measures had been proposed there, largely because of the Catholic church's moderating influence.

### Concerns over human devolution
#### Dysgenics

Dysgenics refers to any decrease in the prevalence of traits deemed to be either socially desirable or generally adaptive to their environment due to selective pressure disfavouring their reproduction.
In 1915 the term was used by David Starr Jordan to describe the supposed deleterious effects of modern warfare on group-level genetic fitness because of its tendency to kill physically healthy men while preserving the disabled at home. Similar concerns had been raised by early eugenicists and social Darwinists during the 19th century, and continued to play a role in scientific and public policy debates throughout the 20th century.
More recent concerns about supposed dysgenic effects in human populations were advanced by the controversial psychologist and self-described "scientific racist" Richard Lynn, notably in his 1996 book Dysgenics: Genetic Deterioration in Modern Populations, which argued that changes in selection pressures and decreased infant mortality since the Industrial Revolution have resulted in an increased propagation of deleterious traits and genetic disorders.

### Compulsory sterilization

Compulsory sterilization, also known as forced or coerced sterilization, refers to any government-mandated program to involuntarily sterilize a specific group of people. Sterilization removes a person's capacity to reproduce, and is usually done by surgical or chemical means.
Purported justifications for compulsory sterilization have included population control, eugenics, limiting the spread of HIV, and ethnic genocide.

### Eugenic feminism

Eugenic feminism was a current of the women's suffrage movement which overlapped with eugenics. Originally coined by the Lebanese-British physician and vocal eugenicist Caleb Saleeby, the term has since been applied to summarize views held by prominent feminists of Great Britain and the United States. Some early suffragettes in Canada, especially a group known as The Famous Five, also pushed for various eugenic policies.

### North American eugenics
#### Eugenics in Mexico

Following the Mexican Revolution, the eugenics movement gained prominence in Mexico. Seeking to change the genetic make-up of the country's population, proponents of eugenics in Mexico focused primarily on rebuilding the population, creating healthy citizens, and ameliorating the effects of perceived social ills such as alcoholism, prostitution, and venereal diseases. Mexican eugenics, at its height in the 1930s, influenced the state's health, education, and welfare policies.

### Nazism and the decline of eugenics

The scientific reputation of eugenics started to decline in the 1930s, a time when Ernst Rüdin used eugenics as a justification for the racial policies of Nazi Germany. Adolf Hitler had praised and incorporated eugenic ideas in Mein Kampf in 1925 and emulated eugenic legislation for the sterilization of "defectives" that had been pioneered in the United States once he took power. Some common early 20th century eugenics methods involved identifying and classifying individuals and their families, including the poor, mentally ill, blind, deaf, developmentally disabled, promiscuous women, homosexuals, and racial groups (such as the Roma and Jews in Nazi Germany) as "degenerate" or "unfit", and therefore led to segregation, institutionalization, sterilization, and even mass murder. The Nazi policy of identifying German citizens deemed mentally or physically unfit and then systematically killing them with poison gas, referred to as the Aktion T4 campaign, is understood by historians to have paved the way for the Holocaust.
   "All practices aimed at eugenics, any use of the human body or any of its parts for financial gain, and human cloning shall be prohibited."
By the end of World War II, many eugenics laws were abandoned, having become associated with Nazi Germany. H. G. Wells, who had called for "the sterilization of failures" in 1904, stated in his 1940 book The Rights of Man: Or What Are We Fighting For? that among the human rights, which he believed should be available to all people, was "a prohibition on mutilation, sterilization, torture, and any bodily punishment". After World War II, the practice of "imposing measures intended to prevent births within [a national, ethnical, racial or religious] group" fell within the definition of the new international crime of genocide, set out in the Convention on the Prevention and Punishment of the Crime of Genocide. The Charter of Fundamental Rights of the European Union also proclaims "the prohibition of eugenic practices, in particular those aiming at selection of persons".

### In Singapore

Lee Kuan Yew, the founding father of Singapore, actively promoted eugenics as late as 1983. In 1984, Singapore began providing financial incentives to highly educated women to encourage them to have more children. For this purpose was introduced the "Graduate Mother Scheme" that incentivized graduate women to get married as much as the rest of their populace. The incentives were extremely unpopular and regarded as eugenic, and were seen as discriminatory towards Singapore's non-Chinese ethnic population. In 1985, the incentives were partly abandoned as ineffective, while the government matchmaking agency, the Social Development Network, remains active.

## Modern eugenics

Developments in genetic, genomic, and reproductive technologies at the beginning of the 21st century have raised numerous questions regarding the ethical status of eugenics, sparking renewed interest in the topic.
Liberal eugenics, also called new eugenics, aims to make genetic interventions morally acceptable by rejecting coercive state programs and relying on parental choice. Bioethicist Nicholas Agar, who coined the term, argues for example that the state should intervene only to forbid interventions that excessively limit a child’s ability to shape their own future. Unlike "authoritarian" or "old" eugenics, liberal eugenics draws on modern scientific knowledge of genomics to enable informed choices aimed at improving well-being. Julien Savulescu further argues that some eugenic practices, like prenatal screening for Down syndrome, are already widely practiced, without being labeled "eugenics", as they are seen as enhancing freedom rather than restricting it.
Some critics, such as UC Berkeley sociologist Troy Duster, have argued that modern genetics is a "back door to eugenics". This view was shared by then-White House Assistant Director for Forensic Sciences, Tania Simoncelli, who stated in a 2003 publication by the Population and Development Program at Hampshire College that advances in pre-implantation genetic diagnosis (PGD) are moving society to a "new era of eugenics", and that, unlike the Nazi eugenics, modern eugenics is consumer driven and market based, "where children are increasingly regarded as made-to-order consumer products". The United Nations' International Bioethics Committee also noted that while human genetic engineering should not be confused with the 20th century eugenics movements, it nonetheless challenges the idea of human equality and opens up new forms of discrimination and stigmatization for those who do not want or cannot afford the technology.
In 2025, geneticist Peter Visscher published a paper in Nature, arguing genome editing of human embryos and germ cells may become feasible in the 21st century, and raising ethical considerations in the context of previous eugenics movements. A response argued that human embryo genetic editing is "unsafe and unproven". Nature also published an editorial, stating: "The fear that polygenic gene editing could be used for eugenics looms large among them, and is, in part, why no country currently allows genome editing in a human embryo, even for single variants".

## Contested scientific status

One general concern that many bring to the table, is that the reduced genetic diversity some argue to be a likely feature of long-term, species-wide eugenics plans, could eventually result in inbreeding depression, increased spread of infectious disease, and decreased resilience to changes in the environment.

### Arguments for scientific validity

In his original lecture "Darwinism, Medical Progress and Eugenics", Karl Pearson claimed that everything concerning eugenics fell into the field of medicine. Anthropologist Aleš Hrdlička said in 1918 that "[t]he growing science of eugenics will essentially become applied anthropology." The economist John Maynard Keynes was a lifelong proponent of eugenics and described it as a branch of sociology.
In a 2006 newspaper article, Richard Dawkins said that discussion regarding eugenics was inhibited by the shadow of Nazi misuse, to the extent that some scientists would not admit that breeding humans for certain abilities is at all possible. He believes that it is not physically different from breeding domestic animals for traits such as speed or herding skill. Dawkins felt that enough time had elapsed to at least ask just what the ethical differences were between breeding for ability versus training athletes or forcing children to take music lessons, though he could think of persuasive reasons to draw the distinction.

### Objections to scientific validity

Amanda Caleb, Professor of Medical Humanities at Geisinger Commonwealth School of Medicine, says "Eugenic laws and policies are now understood as part of a specious devotion to a pseudoscience that actively dehumanizes to support political agendas and not true science or medicine."
The first major challenge to conventional eugenics based on genetic inheritance was made in 1915 by Thomas Hunt Morgan. He demonstrated the event of genetic mutation occurring outside of inheritance involving the discovery of the hatching of a fruit fly (Drosophila melanogaster) with white eyes from a family with red eyes,$^{:336–337}$ demonstrating that major genetic changes occurred outside of inheritance.$^{:336–337}$ Additionally, Morgan criticized the view that certain traits, such as intelligence and criminality, were hereditary because these traits were subjective.
Pleiotropy occurs when one gene influences multiple, seemingly unrelated phenotypic traits, an example being phenylketonuria, which is a human disease that affects multiple systems but is caused by one gene defect. Andrzej Pękalski, from the University of Wroclaw, argues that eugenics can cause harmful loss of genetic diversity if a eugenics program selects a pleiotropic gene that could possibly be associated with a positive trait. Pękalski uses the example of a coercive government eugenics program that prohibits people with myopia from breeding but has the unintended consequence of also selecting against high intelligence since the two go together.
While the science of genetics has increasingly provided means by which certain characteristics and conditions can be identified and understood, given the complexity of human genetics, culture, and psychology, at this point there is no agreed objective means of determining which traits might be ultimately desirable or undesirable. Some conditions such as sickle-cell disease and cystic fibrosis respectively confer immunity to malaria and resistance to cholera when a single copy of the recessive allele is contained within the genotype of the individual, so eliminating these genes is undesirable in places where such diseases are common.
Edwin Black, journalist, historian, and author of War Against the Weak, argues that eugenics is often deemed a pseudoscience because what is defined as a genetic improvement of a desired trait is a cultural choice rather than a matter that can be determined through objective scientific inquiry. This aspect of eugenics is often considered to be tainted with scientific racism and pseudoscience.

## Contested ethical status
### Contemporary ethical opposition

In a book directly addressed at socialist eugenicist J.B.S. Haldane and his once-influential Daedalus, Betrand Russell had one serious objection of his own: eugenic policies might simply end up being used to reproduce existing power relations "rather than to make men happy."
Environmental ethicist Bill McKibben argued against germinal choice technology and other advanced biotechnological strategies for human enhancement. He writes that it would be morally wrong for humans to tamper with fundamental aspects of themselves (or their children) in an attempt to overcome universal human limitations, such as vulnerability to aging, maximum life span and biological constraints on physical and cognitive ability. Attempts to "improve" themselves through such manipulation would remove limitations that provide a necessary context for the experience of meaningful human choice. He claims that human lives would no longer seem meaningful in a world where such limitations could be overcome with technology. Even the goal of using germinal choice technology for clearly therapeutic purposes should be relinquished, he argues, since it would inevitably produce temptations to tamper with such things as cognitive capacities. He argues that it is possible for societies to benefit from renouncing particular technologies, using Ming China, Tokugawa Japan and the contemporary Amish as examples.

### Contemporary ethical advocacy

Bioethicist Stephen Wilkinsonhas said that some aspects of modern genetics can be classified as eugenics, but that this classification does not inherently make modern genetics immoral.
Historian Nathaniel C. Comfort has claimed that the change from state-led reproductive-genetic decision-making to individual choice has moderated the worst abuses of eugenics by transferring the decision-making process from the state to patients and their families.
In their book published in 2000, From Chance to Choice: Genetics and Justice, bioethicists Allen Buchanan, Dan Brock, Norman Daniels and Daniel Wikler argued that liberal societies have an obligation to encourage as wide an adoption of eugenic enhancement technologies as possible (so long as such policies do not infringe on individuals' reproductive rights or exert undue pressures on prospective parents to use these technologies) in order to maximize public health and minimize the inequalities that may result from both natural genetic endowments and unequal access to genetic enhancements.

## In science fiction

The novel Brave New World by the English author Aldous Huxley (1931), is a dystopian social science fiction novel which is set in a futuristic World State, whose citizens are environmentally engineered into an intelligence-based social hierarchy.
Various works by the author Robert A. Heinlein mention the Howard Foundation, a group which attempts to improve human longevity through selective breeding.
Among Frank Herbert's other works, the Dune series, starting with the eponymous 1965 novel, describes selective breeding by a powerful sisterhood, the Bene Gesserit, to produce a supernormal male being, the Kwisatz Haderach.
The Star Trek franchise features a race of genetically engineered humans which is known as "Augments", the most notable of them is Khan Noonien Singh. These "supermen" were the cause of the Eugenics Wars, a dark period in Earth's fictional history, before they were deposed and exiled. They appear in many of the franchise's story arcs, most frequently, they appear as villains.
The film Gattaca (1997) provides a fictional example of a dystopian society that uses eugenics to decide what people are capable of and their place in the world. The title alludes to the letters G, A, T and C, the four nucleobases of DNA, and depicts the possible consequences of genetic discrimination in the present societal framework. Relegated to the role of a cleaner owing to his genetically projected death at age 32 due to a heart condition (being told: "The only way you'll see the inside of a spaceship is if you were cleaning it"), the protagonist observes enhanced astronauts as they are demonstrating their superhuman athleticism. Although it was not a box office success, it was critically acclaimed and influenced the debate over human genetic engineering in the public consciousness. As to its accuracy, its production company, Sony Pictures, consulted with a gene therapy researcher and prominent critic of eugenics known to have stated that "[w]e should not step over the line that delineates treatment from enhancement", W. French Anderson, to ensure that the portrayal of science was realistic. Disputing their success in this mission, Philim Yam of Scientific American called the film "science bashing" and Nature's Kevin Davies called it a "surprisingly pedestrian affair", while molecular biologist Lee Silver described its extreme determinism as "a straw man".
In his 2018 book Blueprint, the behavioral geneticist Robert Plomin writes that while Gattaca warned of the dangers of genetic information being used by a totalitarian state, genetic testing could also favor better meritocracy in democratic societies which already administer a variety of standardized tests to select people for education and employment. He suggests that polygenic scores might supplement testing in a manner that is essentially free of biases.