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The Holocaust, also referred to as the Shoah,[b] was a genocide during World War II in which Nazi Germany, aided by its collaborators, systematically murdered approximately 6 million European Jews, around two-thirds of the Jewish population of Europe, between 1941 and 1945. The Holocaust originated in Nazi Germany in the late 1930s and eventually spread throughout Central and Eastern Europe into countries invaded and occupied by Germany during World War II. The Nazis were racists and believed their race was more important. Nazis believed that the jews were a problem. Many of the non-germans that were living on the land were sent to concentration camps. The main place it took place was eastern Germany and Poland. The Holocaust was largely comprised of a vast network of concentration camps in countries including Germany, Poland, Austria, Ukraine, Norway, the Czech Republic, Slovakia, Belarus, the Netherlands, and France.