Borders changing in Russian Poland in the 19thC, etc.: they didn't. #poland #germany #russia

Roger Lustig

Contrary to the stories we hear so often, the borders of northeastern Europe did not change between 1815 and 1914, with only very minor exceptions. Prussia became part of the German Empire, but its holdings east of the Oder were always the same. Posen Province was the Grand Duchy of Posen until around 1848 (with the King of Prussia as grand duke), and then became the Prussian/German Province of Posen. 

The Balkans were another matter, of course. for more detail.

Roger Lustig
Princeton, NJ USA
research coordinator, GerSIG