Answer:
The first concentration camp in the Nazi system, Dachau, opened in March 1933. By the end of World War II, the Nazis administered a massive system of more than 40,000 camps that stretched across Europe from the French-Spanish border into the conquered Soviet territories, and as far south as Greece and North Africa. The largest number of prisoners were Jews, but individuals were arrested and imprisoned for a variety of reasons, including ethnicity and political affiliation. Prisoners were subjected to unimaginable terrors from the moment they arrived in the camps; it was a dehumanizing existence that involved a struggle for survival against a system designed to annihilate them.
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