i am really don't know what your ideology or whatever in your mind to create this words.
The division of a country is to facilitate the administration, governance, and matters relating to it,The African Union covers an area of ​​29,797,500 km2, and is the largest country in the world if counted as one country,so can u imagine how hard is it to keep it secure if there just 1 country ?
and also i don't really understand about unfair u mean.
for example,is timor leste,under a UN-sponsored agreement between Indonesia and Portugal, the majority of Timor Leste's population chose independence from Indonesia with an area of 15,006 km²,did u think its unfair ?
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i know what you dreaming for,but,its not like that,its not really simple like that.
many many aspect must be think before doing it,rather than create a new system of world economic system,better just adding new system to the traditional system.