No citizen in a nuclear-armed state need learn anything about anyone else, save perhaps about other nuclear-armed states.

The Westphalian system of armed states had its legs chopped out from under it after 1945, but it's taking a while for a new way to materialize.

This is one of the reasons why the Absolute Worst Thing is a nuclear-armed state with uncertain borders. Look around the world and you'll see that the "trouble spots" we spend a lot of time looking at in the news, are those places where nuke powers get to feeling itchy and twitchy about where exactly their countries end.