A nativist is someone who would favor…

Nativism is the political policy of promoting the interests of native inhabitants against those of immigrants, including the support of immigration-restriction measures. In scholarly studies, nativism is a standard technical term, although those who hold this political view do not typically accept the label.(what a nativist is)

Nativist means policies that would favor natives (those born here or, really, those whose ancestors were born here going back a few generations) over newcomer citizens. (this is what a nativist would favor)

acid rain is the answer