The decline of the eugenics movement in the u. s. in the early 20th century resulted from

The decline of the eugenics movement in the U.S. in the early 20th century resulted from its misuse for social and political purposes by the radical groups. Radical groups misused the concept by claiming superiority over other races leading to conflicts including genocides.

the anwser is a) to prevent military conflict

b: the exchange of coined money