What if instead of open borders, there were no borders. What if the entire world (democratic regions at least) sign some sort of pact, each city-state gets 1 v

What if instead of open borders, there were no borders. What if the entire world (democratic regions at least) sign some sort of pact, each city-state gets 1 vote. Each state is taxed x amount to preserve an international military force that's goal is to thwart axis-type powers that might arise, but needs a 60%+ vote from city states. Maybe an ai of some sort could decide the size/scope of region that equates to fair city-states. -- Travel between cities/states would be open as long as you don't mean harm to the area. Cities/states could set their own solutions to problems like healthcare, drugs, basic income, jobs, etc... I think large governments like USA/Canada/EU/China create represive regimes, smaller self-governed entities could run things better locally, and still have open communications/trade/etc with nearby states/cities. It would also be less-prone to corruption as you'd need to pay thousands more politicians (ones in each locality) instead of just in D.C. Personally, I'd love to start a blockchain/identity project to create a universal basic income with fool-proof/sybil-attack proof identity system, making fiat currencies un-needed and creating one-world blockchain-based currency, that helps alleviate pain caused by automation. I think a monetary system like this could take away some of the power and corruption from government.