The problem with this map is: Much of it can - without much trouble - be explained by different events around 1800-1810, and relatively wild development afterwards.
However, Mega-Venice doesn't really seem to fit ...
Indian Australia? Such things might happen after decolonialization, but this is still a bit of a stretch ...
And let's turn to Central Europe:
- Flanders and Rhineland go to France,
- independent Netherlands,
- there is a state of Hannover-Westphalia-Mecklenburg which - depite Germany's dismemberment - has managed to hold the current German-Danish border,
- Brandenburg owns Pomerania-Greater Poland - Prussia - Lithuania,
- Poland consists of Galicia- Lesser Poland - Belarus - Latvia - Estonia,
- a very funny idea: Saxony-Bohemia-Silesia-Lower Austria-Upper Palatinate,
- "Lesser Austria-Hungary" encompasses Tyrol, Slovenia, Croatia, and the Banat
- Venice gets a large share of Switzerland,
- and most suspiciously there is a (slighly gnawed off) Southern Germany with a certain share of Switzerland.
It is mostly this dismemeberment of Switzerland which needs a really good justification ...