The Right to Exist

I've been reading Pope Leo's new encyclical. I was very struck by this line: "Indeed, the promotion of the common good can never be separated from respect for the right of peoples to exist, to preserve their own identity and to contribute their unique qualities to the family of nations."

This is literally all I am asserting when I call myself a nationalist-- this and nothing else.

The question is, how is this to be preserved? It seems to me (and, I think it fair to say, to millions of others) that social and cultural forces are at play today which threaten this very right. But I haven't heard any recommendations from the Vatican on what to do about this.

I suspect (perhaps unfairly) that the Holy Father was not thinking of Western or developed nations when he wrote this. But it certainly applies to them, too.

Pope Francis said similar things in his own writings, arguing for "the globalization of the polyhedron" rather than "the globalization of the sphere". But how is this to be achieved?