September 1. After signing the Molotov-Ribbentrop Pact with the Soviet Union (division of Europe into Germany and the USSR) in 1939, the Germans invaded Poland, breaking the non-aggression pact and starting World War II (also the USSR)
the end result of this war was the enslavement of half of Europe by the Soviet Union for half a century
Fun fact
Poland did not receive war reparations from Germany.
Germany distorts the history of World War II