DBAHC/WI: this map

Then why is Austria-Hungary gone?

I'm guessing there was a war against Italy and Serbia, in which Hungary and the thing north of Austria defected from the crown to form their own republics? I'm not sure what exactly that is though, Bohemia and Slovakia combined into one country?
 
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Explain this map. The only thing I can make out is there must be no pan-German unification, as East Prussia seems to be split between an independent state and...a form of the Grand Duchy of Warsaw?

One thing that conflicts with the theory that it's a scenario where the Germans lost the Great War, how is Ireland independent? It's well known that Irish independence was only possible due to the support given to the IRA by Germany.
 
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