The eugenics movement became associated with Nazi Germany and the Holocaust when the defense of many of the defendants at the Nuremberg trials of 1945 to 1946 attempted to justify their human-rights abuses by claiming there was little difference between the Nazi eugenics programs and the U.S.
Those deemed "unfit to reproduce" often included people with mental or physical disabilities, people who scored in the low ranges on different IQ tests, criminals and "deviants", and members of disfavored minority groups. Such 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. Consequently, many countries adopted eugenic policies, intended to improve the quality of their populations' genetic stock.
In this period, people from across the political spectrum espoused eugenic ideas. While eugenic principles have been practiced as early as ancient Greece, 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. Modern bioethicists who advocate new eugenics characterize it as a way of enhancing individual traits, regardless of group membership. In contemporary usage, the term eugenics is closely associated with scientific racism. Early advocates of eugenics in the 19th century regarded it as a way of improving groups of people. The concept predates the term Plato suggested applying the principles of selective breeding to humans around 400 BC. In recent years, the term has seen a revival in bioethical discussions on the usage of new technologies such as CRISPR and genetic screening, with a heated debate on whether these technologies should be called eugenics or not. Eugenics ( / j uː ˈ dʒ ɛ n ɪ k s/ yoo- JEN-iks from Ancient Greek εύ̃ (eû) 'good, well', and -γενής (genḗs) 'come into being, growing') is a set of beliefs and practices that aim to improve the genetic quality of a human population, historically by excluding people and groups judged to be inferior or promoting those judged to be superior.
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