^This.
OP and two "other" users all joined recently - they even agree with each other. Hilarious...
Anyway, back on topic. I think the Civilization franchise has the amount of civilizations it needs. Furthermore, Bulgaria isnt really much different from all the other European countries left out.
It would be easier to justify Australia, as there isnt any nations represented down there on the map. Europe is swamped as it is. (If you play earth maps, that is.)
It's because I posted the same in Bulgarian forum so more people can share their thoughts. No clonings as far as I know ....

About the swamped Europe and Australia I'll be glad to see more and more nations in the game. After all more people will want to try their own nation ...