They used them to keep the people who they captured. They captured these people because they either were or looked like Jews. These people were put under harsh conditions going to the concentration camps. They also kept prisoners of war in there. Obviously, nobody wanted to go there. If you want to know more look up Anne-Frank's story. She wrote everything she lived during the time Hitler ruled. She died though and didn't make it out alive. She also went to a concentration camp if I remember correctly.
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Pyramids were the largest buildings in Mayan cities and were built as temples and royal tombs. Shrines where sacrifices were made to the gods were at the top, while burial chambers were hidden deep inside. The pyramids were built of stone, and covered with red-painted plaster, but this plaster has not survived.
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The immigrants contributed significantly to United States history from the period 1900 to 1940. Immigration was widely spread in the North while the South (aside from slave immigration) remained mostly American born citizens...about 14.5% of the population were immigrants and it was a huge force for the labor industries
