racial eugenics
Historical and scientific term referring to the selective breeding of humans to improve genetic traits. Often associated with discredited early 20th-century movements.
Racial eugenics was once promoted as a policy in some countries.
優生学 is the broader academic field of eugenics, while 人種改良 specifically refers to the racial aspect of eugenics.
Compound of 人種 (race) and 改良 (improvement). The term is a direct translation of the English 'racial eugenics' and emerged in the early 20th century.