Adolf Hitler (German: 20 April 1889 – 30 April 1945) was an Austrian-born German politician and the leader of the National Socialist German Workers Party (German: Nationalsozialistische Deutsche Arbeiterpartei (NSDAP), commonly referred to as the Nazi Party). He was chancellor of Germany from 1933 to 1945 and dictator of Nazi Germany (as Führer und Reichskanzler) from 1934 to 1945. Hitler is commonly associated with the rise of fascism in Europe, World War II, and the Holocaust.
Hitler's foreign and domestic policies had the goal of seizing Lebensraum ("living space") for the Germanic people. He directed the rearmament of Germany and the invasion of Poland by the Wehrmacht in September 1939, leading to the outbreak of World War II in Europe. Under Hitler's rule, in 1941 German forces and their European allies occupied most of Europe and North Africa. These gains were gradually reversed, and in 1945 the Allied armies defeated the German army. Hitler's supremacist and racially motivated policies resulted in the systematic murder of eleven million people, including nearly six million Jews.
A main Nazi concept was the notion of racial hygiene. On 15 September 1935, Hitler presented two laws—known as the Nuremberg Laws—to the Reichstag. The laws banned marriage between non-Jewish and Jewish Germans, and forbade the employment of non-Jewish women under the age of 45 in Jewish households. The laws deprived so-called "non-Aryans" of the benefits of German citizenship. Hitler's early eugenic policies targeted children with physical and developmental disabilities in a programme dubbed Action Brandt, and later authorized a euthanasia programme for adults with serious mental and physical handicaps, now usually referred to as Action T4.
Although no specific order from Hitler authorising the mass killings has surfaced, he approved the Einsatzgruppen—killing squads that followed the German army through Poland, the Baltic, and the Soviet Union—and he was well informed about their activities. During interrogations by Soviet intelligence officers, the records of which were declassified over fifty years later, Hitler's valet, Heinz Linge, and his adjutant, Otto Günsche, stated that Hitler had a direct interest in the development of gas chambers.
Between 1939 and 1945, the SS, assisted by collaborationist governments and recruits from occupied countries, were responsible for the deaths of eleven to fourteen million people, including about six million Jews, representing two-thirds of the Jewish population in Europe, and between 500,000 and 1,500,000 Roma. Deaths took place in concentration and extermination camps, ghettos, and through mass executions. Many victims of the Holocaust were gassed to death, whereas others died of starvation or disease while working as slave labourers.
Hitler's policies also resulted in the killings of Poles and Soviet prisoners of war, communists and other political opponents, homosexuals, the physically and mentally disabled, Jehovah's Witnesses, Adventists, and trade unionists. Hitler never appeared to have visited the concentration camps and did not speak publicly about the killings.