Nativism is a manner of doing politics with the main aim of protecting the interests of the native inhabitants of a certain territory over inmigrants that might arrive to those lands. In conclusion, it is a political viewpoint that is explicitly positioned against inmigration and would work to restrict the arrival of such population flows.
Nowadays, it conforms an important political issue in many developed countries, and it is a widely-used approach mainly by right-wing political parties and leaders.