The Holocaust refers to the systematic persecution and murder of approximately six million Jews by the Nazi regime and its allies between 1933 and 1945. Beginning with the rise of the Nazis to power in Germany in 1933, the new government utilized state power to persecute Jews and others deemed "racially inferior" through ghettos and concentration camps. Over the following years, the Nazi killing operations expanded, ultimately murdering around two-thirds of Europe's Jewish population in factories of death like Auschwitz through mass shootings, gas chambers, starvation, and forced labor. Millions of other groups were also targeted in the Holocaust on racial, political, ideological, and other grounds.