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The Holocaust, also known as the Shoah, was the genocide of European Jews during World War II. Between 1941 and 1945, Nazi Germany and its collaborators systematically murdered some six million Jews across German-occupied Europe, around two-thirds of Europe's Jewish population. Hitler was obsessed with the idea of the superiority of the “pure” German race, which he called “Aryan,” and with the need for “Lebensraum,” or living space, for that race to expand. In the decade after he was released from prison, Hitler took advantage of the weakness of his rivals to enhance his party’s status and rise from obscurity to power. On January 30, 1933, he was named chancellor of Germany. After President Paul von Hindenburg’s death in 1934, Hitler anointed himself as “Fuhrer,” becoming Germany’s supreme ruler.