If Napoleon is dismantling Austria, Russia is not going to be friendly.
Hmmm I can see the following potentially if the Hungarians refuse to play ball.
- Napoleon annexes Croatia-Slavonia and Slovene Styria to the Illyrian Provinces. A Kingdom of Illyria is established.
- Transylvania is made an independent Kingdom. Since the point of Transylvania is to neuter Hungary, I think a western boundary on the Tisza makes sense.
- Warsaw gets Galicia-Lodomeria and the Protestant Polish bits of Austrian Silesia. Warsaw's name is changed to Poland.
- Bukovina goes to either Transylvania or Poland.
- I'm not really sure what to make of the Slovaks. Did they have a national consciousness yet? I suppose he could create a new Duchy of Nitra. Nitra was a Polish vassal from 1001-1030. Maybe Poland could get Slovakia.
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I marked off Slovakia and Bukovina because I was unsure of what to make of them. The issue I think with creating Slovakia is that it'd be pretty much creating a country from scratch. All the local nobility are Hungarian. Even annexing it to Poland seems like a bit of a headache, although I don't think that'd be impossible. I wonder if Poland would be able to maximize the use of Slovakia.
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I kind of like this Warsaw + Galicia + Bukovina + Slovakia = Mega Poland. It's funny-looking in a good way. I wonder if all the troops it raises on top of what Warsaw raised OTL would be Polish, or if there'd be a sizable number of Ruthenes, Slovaks, and Romanians as well.
The big downside for Poland is that Slovakia's on the other side of the Carpathians.