Challenge:How can you get this map/scenario in Europe happen?

How possible is this
europe8du12_edited-2333-1.jpg

sorry for bad coloring..

the light coloring are for the small islands
 
Um, almost Impossible. You've got the 1945 Oder-Neiss border in a map which requires a POD in the 1200s to get most of the rest of the stuff.
 
As much as I like to try to explain odd maps, I'd also like a better map first. This one is full of Space Filling Blobs.
 
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