Final answer:
The history of looking for racial differences and attributing behaviors to them has a long and complex history. Eugenics was a pseudoscientific approach that attempted to prove the existence of innate racial differences and validate white supremacy. Modern research has shown that race is not biologically identifiable and previous racial categories were based on pseudoscience and used to justify racist practices.
Step-by-step explanation:
The history of looking for racial differences and attributing behaviors to them has a long and complex history. In the past, eugenics was used as a pseudoscientific approach to prove the existence of innate racial differences and validate white supremacy. However, most scientists distanced themselves from eugenics due to its biased agenda. Additionally, racial stereotypes and discrimination persisted even after the abolition of slavery, further perpetuating prejudiced opinions. In modern times, research has shown that race is not biologically identifiable and previous racial categories were based on pseudoscience and used to justify racist practices.