The date of 11 November 1918, being the day on which Poland regained its independence, is a symbolic date. Exactly on that day, an armistice ending the First World War was concluded in a wagon in the forest of Compiègne.
The Union of Soviet Socialist Republics was the first communist state in history. The decision to create it was taken on 30 December 1922.
The first Siberian fortresses were built by Polish prisoners of war who had been taken captive by Moscow authorities precisely during the war initiated by Stefan Batory.