We all helped the lady take her groceries to the car.
The correct answer is Italy invades Ethiopia
The Fall of Nanjing happened in 1938 after a four months battle. Sudetenland was also annexed by Hitler in 1938. Invasion of Ethiopia happened during the Second Italo-Ethiopian war in 1935, which is 3 years before the other two events, even though the war with Ethiopia did last until 1939, which is four years after the invasion began.
The correct answer is that they built special exterminations in camps in Poland. When the Einsatzgruppen proved to be too slow for the Nazis, they built special extermination camps in Poland. The Einsatzgruppen were the Schutzstaffel death squad of the Nazis that was responsible for the massive killings.
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