Final answer:
At the beginning of the 1900s, eugenics was a commonly accepted concept that aimed to improve the genetic makeup of the human race. It became discredited when Nazi Germany implemented an extensive eugenics program in the 1930s and 1940s.
Step-by-step explanation:
At the beginning of the 1900s, eugenics was a commonly accepted concept that aimed to improve the genetic makeup of the human race. It was based on the idea of selective breeding and government involvement to produce genetically superior individuals. However, eugenics became discredited when Nazi Germany implemented an extensive eugenics program in the 1930s and 1940s, which involved forced sterilization and genocide.