From family to clan to tribe to people to state. This is the warp of civilization. Common origin, history, heritage, and destiny define a people. A land exists to hold its own people; a state to allow them to live their unique way of life. Those not members of the family, tribe, clan, people have no ties to the land and no proprietorship in the state.
What sense is there in the idea that citizenship in a nation -- created by a people of common origin, history, heritage, culture, language -- be handed to those who reside on its land, regardless of how they got there, regardless of who they are? A country is the home of its people. From time immemorial, this has been so; the country was the home of a particular people. The citizens were of the same race, culture, language -- of common blood & shared history. This is normal, natural, and reasonable.
Anything else is perverse.
A family needs a place to live, so it acquires a house. The house belongs to that family and to no one else. So it is with the extended family -- the nation; one family/nation owns the land. Strangers who arrive do not become co-owners of the land simply by dwelling there, do not & cannot become members of the family just by living among it. The land and nation are not theirs. They have or ought to have their own, where they belong (in every sense of the word).
It is the nature of man to feel closer to limited circles of people. This is the way it always was, the way it is, the way it will remain -- it's universal, biological, and inevitable. Just as family takes precedence over nation, so nation above world. My family, our house; my people, our land. No ruler, worker, or -ism ever changed that nor ever will in the long term. Internationalism is an illusion. The power of nationalism is greater than that of globalism. Race, heritage, and culture pull strong on the heart.