The Third Reich first used concentration camps as places of unlawful incarceration of political opponents and other "enemies of the state". Large numbers of Jews were not sent there until after Kristallnacht in November 1938. Although death rates were high, the camps were not designed as killing centers. After war broke out in 1939, new camps were established, some outside Germany in occupied Europe. In January 1945, the SS reports had over 700,000 prisoners in their control, of which close to half had died by the end of May 1945 according to most historians. Most wartime prisoners of the camps were not Germans but belonged to countries under German occupation.
After Kristallnacht, Jewish businesses were expropriated, private employers were urged to sack Jewish employees, and offices were set up to speed emigration. Imprisoned Jews could buy freedom if they promised to leave the country, abandoning their assets. By the outbreak of war in September 1939, half of Germany's 500,000 Jews had fled, as had many Jews from Austria and the German-occupied parts of Czechoslovakia.
Immediately after the war, in the Spring of 1945, the majority of Americans believed that there had been homicidal gas chambers in most of the Nazi concentration camps, certainly in Dachau, Buchenwald and Bergen-Belsen. After seeing the horrible newsreels of thousands of dead bodies in the camps, there was no doubt in most people's minds that the Nazis had carried out mass gassings in Germany, as well as in the death camps in what is now Poland. Even today, news reports confirm that there were gas chambers at Bergen-Belsen, as well as at Buchenwald and Dachau.