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

1944 - 1945 - The liberation of Czechoslovakia, 20. 6. - 29. 8. 1944 - Operation Bagration, 22. 6. 1941 – Operation Barbarossa - Nazi attack on the USSR, 17.9.1939 - Soviet invasion of Poland

26.8. 1980 Solidarity strike in Wroclaw

22. 6. 1941 – Operation Barbarossa - Nazi attack on the USSR, 1945 - 1946 Resettlement of Poles in the "Regained lands"

17.9.1939 - Soviet invasion of Poland , 1945 - 1946 Resettlement of Poles in the "Regained lands"

1940 Katyn massacre, 8. 5. 1945 - End of WWII, 21. 8. 1968 - Invasion of the Warsaw Pact troops, 17. 11. - 29. 12. 1989 - The Velvet Revolution in Czechoslovakia

1989 - The fall of the iron curtain

8. 5. 1945 - End of WWII, 12.1.1945 - 13.2.1945 Vistula–Oder Offensive

Vznik nezávislého odborové hnutí Solidarita, Výjimečný stav v Polsku, 17. 11. - 29. 12. 1989 - The Velvet Revolution in Czechoslovakia