Nativism
Etymology
From Latin nativus ("innate, produced by birth," from nasci, "to be born"), with the -ism of a doctrine. The political sense crystallized in mid-nineteenth-century America, where "nativist" parties organized against Catholic and immigrant newcomers. The root idea of "belonging by birth" is exactly what the politics turns into a dividing line.
noun · /NAY-tiv-iz-um/
A political stance favoring the interests of established inhabitants over those of immigrants and outsiders.
What it names
It names the impulse to draw a sharp line between the native-born and the newcomer, and to treat belonging as a birthright to be defended.
Example
The new visa restrictions were sold as economics, but their language leaned unmistakably on nativism.
Related idea
Chauvinism is aggressive pride in one’s own group; nativism is the narrower politics of privileging the native-born against outsiders. Nativism often draws its emotional fuel from chauvinism.