As World War I drew to a close, the German Empire fell apart to uprisings and partitions for several years.
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Sources used:

D.K. Atlas of World History
Karu's video for Interwar Eastern Europe specifically for the Polish uprising:    • Video  
Official Reichswehr maps, found here: https://www.loc.gov/resource/g6362rm....
The German Communist Party in Saxony, 19241933 by Norman H. LaPorte
Wikipedia
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