The way I have it in the summary is:

The Austria-Hungarian monarchy collapsed a little later, in 1922, for more or less the same reason as in real life. That same date, Austria and Hungary, now separate countries, end their participation in the Great War. But Czech Republic and Croatia/Slovenia remained Austrian. I kept Slovakia part of Austria too (because I kept what I thought I had read from Keen). Then in 1970, Czech Republic and Slovakia have some uprisings (again, just going by Keen's history) and the territories are absorbed by Poland. Austria, being all weak and whatnot, fails to fight back and just gets bullied basically.

Everything that had a link to Keen's Poland was a clusterfuck really, I just tried to make sense of a few tiny things and left the rest more or less the same.

But again, I'm alright with going with whatever makes more sense.