This idea needs a lot more examination than it got. "Nation States" have been responsible for most of the major catastrophes recently.
Nation States came from a "People's " reaction to Feudalism, and was originally supposed to be a unified Ethnic group. They were corrupted by success, and became Empires, made up of warring factions. Look at the US. They are intrinsically unstable, since they are based on force and/or fraud, and have no obvious other way of settling disputes with "others". They are basically like the Greek City-States, which evolved into Cities. (Civilization) But cities have solved their political problems by means of Laws, etc Nations cannot do this, because their "principles" do not involve respect for any OTHER nation state. That would be contradictory If you want to see how this all turns out, look at pre Dynastic Chinese History: the "Period of Warring States", They tried everything: Alliances, Balance s of Power, NATO, etc. it all failed.