> What I don't understand is the concept of NATO or the EU: why would a group of countries willingly band together as "happy vassals
NATO: Russia is a threat to both Europe and the US, lets band together to make sure we can fight them.
EU: Europe keeps fighting wars, lets make our economies more inter-dependent so that doesn't happen as much.
For NATO, I can see the happy vassals thing (and that's what the Belgian PM was referring to), but can you explain who is the overlord in the EU example?