Final answer:
Nativists used pseudoscientific ideas, such as eugenics, to justify their discriminatory attitudes based on false claims of racial superiority.
Explanation:
Nativists utilized scientific ideas to support their discriminatory beliefs, especially through eugenics which aimed to falsely demonstrate racial superiority. They employed techniques like measuring brain sizes to justify their prejudice against nonwhites and immigrants based on pseudoscientific claims.
Learn more about Nativists and scientific ideas here:
https://brainly.com/question/10988800
