Adolf Hitler, as dictator of Nazi Germany, was central to the outbreak of World War II. His ideology promoted German nationalism, Aryan racial superiority, and territorial expansion. He defied the Treaty of Versailles, rearmed Germany, and annexed territories in Europe. His invasion of Poland in 1939 directly caused the war.
Hitler’s ambitions led to horrific atrocities, including the Holocaust, and devastated much of Europe. His leadership turned Germany into a totalitarian regime that pursued war, genocide, and conquest until his death in 1945.