Eugenics started by trying to transfer the lessons of selective animal breeding to people. IQ measurements had a connection with eugenics, and low IQ individual

Eugenics started by trying to transfer the lessons of selective animal breeding to people. IQ measurements had a connection with eugenics, and low IQ individuals were targetted... in the US. We know IQ is inheritable but IQ is influenced by many factors like pollution and nutrition. The approach was very pseudoscientific in nature.