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  Nazi Germany annexed in 1939 after invading and conquering Poland.
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  Construction began in May 1940 in an abandoned Polish army artillery barracks, located in a suburb of the city.
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  The SS authorities established three main camps near the Polish city of Oswiecim: Auschwitz I in May 1940;
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  During the summer and autumn of 1941, Zyklon B gas was introduced into the German concentration camp system as a means for murder.
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  Construction of Auschwitz II, or Auschwitz-Birkenau, began in the vicinity of Brzezinka in October 1941.
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  “Provisional” gas chamber I went into operation in January 1942 and was later dismantled.
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  the Inspectorate of Concentration Camps was an agency of the SS Main Office
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  trains arrived at Auschwitz-Birkenau frequently with transports of Jews from virtually every country in Europe occupied by or allied to Germany.
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  the SS decreed that Auschwitz-Birkenau and Auschwitz-Monowitz would become independent concentration camps
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  Between late April and early July 1944, approximately 440,000 Hungarian Jews were deported, around 426,000 of them to Auschwitz
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  several hundred prisoners assigned to Crematorium IV at Auschwitz-Birkenau rebelled after learning that they were going to be killed
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  Auschwitz II was reunified with Auschwitz I
