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Jayciedubb With a free market economy.
Just imagine if the US government and economic structures were applied to the whole world. Adding a new federal layer on top. To give it a name, call it the New UN.
The top layer is the New UN. It has a world president or prime minister, then a world congress, assembly, or parliament, and world courts. Yet unlike the current UN it has supreme authority over all member nations, yet only for specifics enumerated powers. All other powers are left to the member nations. Which in this case would be like US states. That is, the relationship of the UN to the nations is like the relationship between the US and the US states.
Then each nation has its own structure. It should be republican (little r), with checks and balances, federalism, rule if law, rights, etc. But the New UN laws always are supreme. Etc.
Or maybe at the top a looser confederation, like the EU has in Europe. Yet still the New UN should have some teeth to it.
Within this New UN there are no militaries, in the traditional sense. The world is one big "nation." There are no wars. Only civil unrest and rebellion. So all military forces are police forces, really. Yes they can have military equipment and training, but they are a tool of law enforcement, to fight crime, put down violence, restore order, etc.
But all would have to consent to membership. If nations want to opt out, they can. Yet then maybe the New UN would then need its own military, just in case. It could also help with maintaining order within the New UN member states.
This New UN likely would have to exclude a lot of current nations: those with dictators, communism, theocracy, oppression. To join they would have to be like and have governments and economies like the US or Europe, Japan, etc. And freedoms, etc.
So no Irans, Russias, Chinas, North Koreas, Saudi Arabias, etc. Heck, maybe we would have to expel places like Texas, too, LOL.