I see. You don’t even need a federation, a customs union usually suffice. E.g. there have been zero wars within the European Union for example. Although I’ll ad

I see. You don’t even need a federation, a customs union usually suffice. E.g. there have been zero wars within the European Union for example. Although I’ll admit, looking at the internal struggle is an unfair simplification as European parties (as with the United States) have plenty of that external violence going on.