DBWI Challenge: Balkanized Earth

Calling all cartographers and linecharters! Try to craft out a scenario with a POD no earlier than 1900, where by 2000 the world's nations have not experienced unification.
 
I don't see how this is possible. Seriously, I've yet to meet anyone who'd actually want separate nations.
 
I barely dare mention it, but if Comrade Stalin had died earlier the Unification War might not have gone so smoothly.
 
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