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Lets say in 1920's or early 30's (the most 1933), some uprising happen in Kingdom SHS (Yugoslavia), which sparks and ignite more agresive will of Croats (and probably Slovenes) to go independent (whether or not they can survive on their own on long terms is another story), while Serbs being so fed up with them they let them be.
What would the attitude toward new country be?
I assume Italy would be agressive and trying to grab as much land as it can, but what about Austria, Hungary, Germany, Soviet Union, little entente members (Romania and Czechoslovakia)?
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