system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do we still have a need for hundreds of separate sovereign nations?

I can understand how different areas of the world developed separately. I'm not advocating this situation; but sharing resources, advancements, surpluses, etc. just seems to make sense.
gpt
It makes perfect sense. 

It wouldn't work though. The French wouldn't want to be ruled from Berlin; the Japanese from Beijing; the Zimbabweans from Pretoria; the Americans from Ottawa.

There is too much national pride for it to happen in our life time. Governments wouldn't want to give up their power, and citizens of a small country wouldn't want to be ruled by a big or vice verse.