---
title: "History of eugenics"
chunk: 8/12
source: "https://en.wikipedia.org/wiki/History_of_eugenics"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T03:59:37.158532+00:00"
instance: "kb-cron"
---

In the early part of the Shōwa era, Japanese governments executed a eugenics policy to limit the birth of children with "inferior" traits, as well as aiming to protect the life and health of mothers. The Race Eugenic Protection Law was submitted from 1934 to 1938 to the Imperial Diet. After four amendments, this draft was promulgated as the National Eugenic Law  in 1940 by the Konoe government. According to the Eugenic Protection Law (1948), sterilization could be enforced on criminals "with genetic predisposition to commit crime", patients with genetic diseases such as total color-blindness, hemophilia, albinism and ichthyosis, and mental affections such as schizophrenia, and manic-depressiveness, and those with epilepsy. Mental illnesses were added in 1952.
The Leprosy Prevention laws of 1907, 1931 and 1953, the last one only repealed in 1996, permitted the segregation of patients in sanitariums where forced abortions and sterilization were common, even if the laws did not refer to it, and authorized punishment of patients "disturbing peace", as most Japanese leprologists believed that vulnerability to the disease was inheritable. There were a few Japanese leprologists such as Noburo Ogasawara who argued against the "isolation-sterilization policy" but he was denounced as a traitor to the nation at the 15th conference of the Japanese Association of Leprology in 1941.
One of the last eugenic measures of the Shōwa regime was taken by the Higashikuni government. On 19 August 1945, the Home Ministry ordered local government offices to establish a prostitution service for Allied occupation soldiers to preserve the "purity" of the "Japanese race". The official declaration stated: "Through the sacrifice of thousands of "Okichis" of the Shōwa era, we shall construct a dike to hold back the mad frenzy of the occupation troops and cultivate and preserve the purity of our race long into the future..."

=== Korea ===
Early in the Japanese administration of Korea, staff at the Japanese Association of Leprology attempted to discourage marriage between Japanese women and Korean men who had been recruited from the peninsula as laborers following its annexation by Japan in 1910. In 1942, a survey report argued that "the Korean laborers brought to Japan... are of the lower classes and therefore of inferior constitution...By fathering children with Japanese women, these men could lower the caliber of the Yamato minzoku". However, eugenics pioneer Unno Kōtoku of Ryukyu University influentially argued based on heterosis in plants that exclusive Japanese endogamy might cause "degeneration" of the Japanese race. Since he regarded intermarriage with white or black people as "disastrous", he advocated intermarriage with Koreans, whose "inferior" physical characteristics would be subsumed by the "superior" Japanese, according to his thinking. Japanese-Korean intermarriage was promoted by the government in Korea using serological studies that claimed to prove that Japanese and Koreans had the same pure ancestral origin.
In the 20th century, the idea of eugenics was imported to South Korea from Nazi Germany and Imperial Japan. During the 1970s and 80s, the military dictatorships of the Fourth and Fifth Republics of South Korea established various internment and concentration camps, most famously the so-called Brothers Home, which forcibly detained people from the lower classes (often falsely accused of being homeless). Additionally, from the mid-1970s to the mid-1990s, these dictatorships, as well as the currently ruling Sixth Republic which succeeded them, sterilized mentally ill and intellectually disabled individuals; the exact number of individuals sterilized is not known. A law imposed by Park Chung-Hee permitting the involuntary sterilization of mentally ill or intellectually disabled South Koreans was repealed only in 1997.

=== China ===
Eugenics was one of many ideas and programs debated in the 1920s and 1930s in Republican China, as a means of improving society and raising China's stature in the world.  The principal Chinese proponent of eugenics was the prominent sociologist Pan Guangdan, and a significant number of intellectuals entered into the debate, including Gao Xisheng, biologist Zhou Jianren, sociologist Chen Da, and Chen Jianshan, and many others. Chen Da is notable for the link he provides to the family planning policy and One Child Policy enacted in China after the establishment of the People's Republic of China.

=== Singapore ===

=== Other countries ===
Other countries that adopted some form of eugenics program at one time include Sweden, Denmark, Estonia, Finland, France, Iceland, Norway, and Switzerland with programs to sterilize people the government declared to be mentally deficient. In Denmark, the first eugenics law was passed in 1926, under the Social Democrats, with more legislation being passed in 1932. Though the sterilization was initially voluntary (at least theoretically), the law passed in 1932 allowed for involuntary sterilization of some groups.

=== Marginalization after World War II and crypto-eugenics ===