Hitler was fully responsible for the order for the mass executions in Poland in 1939 and 1940. He was also actively engaged in setting up plans for a Jewish reservation in Poland and he backed the Madagascar plan. He was continually preoccupied with further deportations and deportation plans. In 1941 Hitler ordered the extermination of the Jewish-Bolshevist intelligentsia and the elimination of every potential enemy in the occupied Eastern territories. He was fully aware of mass executions of Jewish civilians in these territories.In mid September 1941 Hitler ordered the beginning of mass deportations from Germany to ghettos in Eastern Europe. During Autumn 1941 and the following Winter, when preparation for the Final Solution in Europe were in full swing, Hitler spoke at various occasions openly about the annihilation of the Jews in Europe. It can be ruled out that the massive preparations for the systematic murder of European Jews in extermination camps in Poland, undertaken in spring and summer of 1942, were taken without his consent or his knowledge.Private diaries of Nazi propaganda maestro Joseph Goebbels and Gestapo chief Heinrich Himmler unearthed from the secret Soviet archives show that Adolf Hitler personally ordered the mass extermination of Jews on December 12, 1941 during a meeting of Nazi German regional governors in the chancellery. Goebbels told his diary: "With regards to the Jewish question, the Fuhrer decided to make a clean sweep." And from a number of letters and speeches of Himmler it becomes clear, that the Reichsfuhrer SS referred to the Holocaust as a task he had to carry out on the behalf of the highest authority in the Third Reich. From the Nuremberg Laws in 1935 to Kristallnacht in 1938, Hitler slowly removed Jews from German society. However, with the cover of World War II, the Nazis created an elaborate and intensive system to work Jews as slaves and kill them. Hitler is considered one of the most evil people in history because of the Holocaust.
The Holocaust and Germany's war in the East was based on Hitler's long-standing view that the Jews were the great enemy of the German people and that Lebensraum was needed for the expansion of Germany. He believed Eastern Europe would be an ideal location for expansion, once Poland and the Soviet Union were defeated and the Jews and Slavs were removed or killed. The Generalplan Ost ("General Plan for the East") called for the population of occupied Eastern Europe and the Soviet Union to be deported to West Siberia, used as slave labor, or murdered; the conquered territories were to be colonised by German or "Germanised" settlers. The original plan called for this process to begin after the conquest of the Soviet Union, but when that failed to happen, Hitler moved the plans forward. By January 1942 the decision had been taken to kill the Jews, Slavs, and other deportees considered undesirable.