I take it you see nationality as a question with a single answer. In my view that's not how it works at all. The way I feel about it is that I feel different degrees of "being at home" in different countries. I'm at home both in Poland and in Norway. But in different ways. Norway is my home, the place I've lived most of my life. It's normal for me to think about it as my place of residence. Poland is a place I know on many levels, in some ways I know it better than Norway, but not really in terms of residence.
And it doesn't stop there. I've only been in Holland for a few years, but if I were to stay here another 20 years I would effectively gain another nationality equal to the first two.
Btw, this is something that people without immigrant experience can nehever grasp in my experience. They just keep stubbornly insisting that they know otherwise, without ever experiencing it.
Talk to Ze about this. He's lived in many countries and he has relationships with many of them.