What would be the pros and cons of a global nation?

The whole world and all the people in it belong to one complete country, same currency, same everything else that would happen in a country. There could be different regions leaders sort of like premiers, but there would be no president, king or whatever you want to call it. Instead the government will consist of... show more The whole world and all the people in it belong to one complete country, same currency, same everything else that would happen in a country.
There could be different regions leaders sort of like premiers, but there would be no president, king or whatever you want to call it. Instead the government will consist of representatives from all the regions.
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