Because that’s pretty much the definition of nation-state: control over a territory and what happens inside it. If you meant to ask why they should belong to th

Because that’s pretty much the definition of nation-state: control over a territory and what happens inside it. If you meant to ask why they should belong to the nation states, well, if they belonged to “humanity” someone would still be calling the shots, and there’s no guarantee it would be the Norwegians.