The Holocaust was the systematic state-sponsored persecution and murder of approximately six million European Jews by the Nazi regime and its collaborators between 1933 and 1945. The Nazis believed Germans were racially superior and Jews were an inferior threat to the German racial community. They began by stripping Jews of citizenship and livelihoods before deporting them to overcrowded ghettos and concentration camps where appalling conditions killed thousands through disease, starvation, brutal treatment and exposure. The Holocaust occurred throughout German-occupied Europe, with Jews murdered in mass shootings and gas chambers. It was driven by Nazi racial antisemitism and conspiracy theories blaming Jews for Germany's defeat in World War I.