In 1933, with the rise to power of Adolf Hitler and the Nazis in Germany, the Jewish situation became more severe. Economic crises, racial anti-Semitic laws, and a fear of an upcoming war led many Jews to flee from Europe to Palestine, to the United States and to the Soviet Union. In 1939 World War II began and until 1941 Hitler occupied almost all of Europe, including Poland—where millions of Jews were living at that time—and France. In 1941, following the invasion of the Soviet Union, the Final Solution began, an extensive organized operation on an unprecedented scale, aimed at the annihilation of the Jewish people, and resulting in the persecution and murder of Jews in political Europe, inclusive of European North Africa (pro-Nazi Vichy-North Africa and Italian Libya). This genocide, in which approximately six million Jews were methodically exterminated, is known as the Holocaust or the "Shoah" (Hebrew term). In Poland, three million Jews were killed in gas chambers in all concentration camps combined, with one million at the Auschwitz camp complex alone.