17.9.1939 - Soviet invasion of Poland , 22. 6. 1941 – Operation Barbarossa - Nazi attack on the USSR, 20. 6. - 29. 8. 1944 - Operation Bagration

26.8. 1980 Solidarity strike in Wroclaw

1945 - 1947 Expulsion of Germans from former German East territories, 1945 - 1946 Resettlement of Poles in the "Regained lands" , 8. 5. 1945 - End of WWII

1945 - 1947 Expulsion of Germans from former German East territories, 1945 - 1946 Resettlement of Poles in the "Regained lands" , 8. 5. 1945 - End of WWII, 30. 5. 1953 – 3. 6. 1953 – The monetary reform and subsequent public upheaval

September 1939- occupation of the entire Upper Silesia by Germany, March 1945 - the occupation of Upper Silesia by the Soviet army

1945 - 1947 Expulsion of Germans from former German East territories, 1945 - 1946 Resettlement of Poles in the "Regained lands" , 21. 8. 1968 - Invasion of the Warsaw Pact troops

1. 9. 1939 - The outbreak of the WW2, 17.9.1939 - Soviet invasion of Poland , 1945 - 1946 Resettlement of Poles in the "Regained lands"

Vznik nezávislého odborové hnutí Solidarita, Výjimečný stav v Polsku

1. 9. 1939 - The outbreak of the WW2, 5. 1. - 21. 8. 1968 - The Prague Spring, 21. 8. 1968 - Invasion of the Warsaw Pact troops, 17.9.1939 - Soviet invasion of Poland

1940 Katyn massacre, 1943 - Conflict between Poles and Ukrainians in Eastern Galicia and Volhynia, 1945 - 1946 Resettlement of Poles in the "Regained lands"