As long as "money" means "everyone's money" and not "money for oligarchs", then that's infinitely better than what nations and empires have historically been bu

As long as "money" means "everyone's money" and not "money for oligarchs", then that's infinitely better than what nations and empires have historically been built on: ethnicity, religion, geography, tribal identity, etc. You basically described every modern nation since 1776, and explained the purpose of international trade agreements. Governments (ideally) exist to allow everyone to coexist and peacefully do business with each other and not hurt each other, and ideally the only points of contention are drawing the lines at which people are considering to be hurting one another. Ideally. In practice everyone falls short of course, but that's why ideals exist, to have goals to try to live up to.