How did nativists try to use fake acience?

Nativists often employed pseudo-scientific theories to support their beliefs about racial superiority and the supposed inferiority of immigrant groups. They misused concepts from genetics, anthropology, and psychology to claim that certain races were biologically predisposed to criminality or social failure. Such distortions aimed to legitimize discriminatory policies and foster xenophobia, framing Immigration as a threat to societal stability and national identity. Ultimately, these tactics sought to reinforce a narrative that favored the dominance of certain ethnic groups over others.