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The first concentration camp, the Dachau, opened in March of 1933. It was a training center for the SS camp guards. The camp's routine and organization became a model for all Nazi concentration camps. The camp was separated into two parts.
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From 1934, the commandants made the prisoners as forced labors for the good of SS construction building projects.
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From 1939 to 1942, the number of concentration camps quadrupled as homosexuals, political prisoners, criminals, mentally ill people, gypsies, and others too without a juducial process either.
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Concentration camps in the east were inspired by the vast prisoner growth and territorial conquest and it grew the camp system more to the east.
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After Germany invaded Poland, Auchwitz was made the officil name again after being called Oswiecim.
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Operation Reinhard was a Nazi plan in the general government to murder Polish Jews, and it was one of the most deadly phase of the holocaust.
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In 1942, the crematorium was built alongside the main camp and it also composed of the old and new crematorium in addition to a new gas chamber.
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Trains transported Jews to the gas chambers of the camp all over Nazi-occupied Europe from 1942-1944
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All camps were liberated by Soviet forces along with Allied forces.
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The Auschwitz concentration camp was liberated in January of 1945 by the Soviets.
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The Buchenwald concentraion camp was liberated in April of 1945 by the Americans.
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The Dachau concentration camp was liberated in April of 1945 by the Americans.
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In the same year, American forces liberated the prisoners which had been sent on the death march.