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1918 · following an uprising in Poland, the Prussian provinces of Posen and West Prussia become occupied by Polish insurgents, smaller areas remain in German hands
20th of November in 1919 · the Governmental Office for the Distrikt of Grenzmark Posen - West Prussia begins with its work
20th of January in 1920 · the Versailles Dictate comes into force, the occupied territories of Posen and West Prussia had to be ceded officially
11th of January in 1921 · the name Grenzmark Posen - West Prussia becomes officiallyv
1st of July in 1922 · Ostmark Law, Grenzmark Posen - West Prussia becomes a new province of Prussia
1st of October 1938 · the Province becomes dissolved and annexed mostly to the Prussian province of Pomerania, some areas come to the Prussian Provinces of Brandenburg and Lower Silesia
1945 · occupied by Poland
Source: Wikipedia (D)