Describe at least one manifestation of 20th century public policy that was based in darwinian

One example of public policy that was based on Darwinian thought is that of eugenics. Eugenics is the idea of trying to improve the genetic quality of a population by not allowing the reproduction of certain groups, and encouraging the reproduction of others. Although the concept of eugenics predates Darwin, it gained scientific support after his theory of evolution.

The concept is heavily disputed. Moreover, it carries negative associations due to its identification with the policies of Nazi Germany. However, eugenics was influential in a variety of regimes during the 20th century. In America, this was embodied in the American Eugenics Society, founded in 1922.

genetics is the study of how dna works, the methodologies defining the new recent technologies allow scientist to have a panoramic view of the entire dna landscape, especially how genomes interact with their environment, including off course, factors outside their organisms.

thus is very possible the existence of both scenarios, where populations of isolated individuals have different genetic traits, and share traits related to genetic mutation, due rats can easily travel overseas using human transport channels. so scientists could get a vast number of data, including human interaction, evolution of rodents, health development, spread of infections, development of new organisms, how genomes evolve in different environments and so on.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.