Social degeneration was a widely influential concept at the interface of the social and biological sciences in the 18th and 19th centuries. Wikipedia

A late 19th–early 20th century sociological concept Wikipedia Disambiguation

A pseudoscientific 19th century theory that civilization was declining due to biological change because of "hereditary taint". Such "taint" was blamed on marginalized racial and ethnic groups, as well as upon gay people and other marginalized groups. Wikidata