Without prior declaration of war the German army marched on 1 September 1939 in Poland. The attack on Poland, not only marks the beginning of World War II, but also to a large-scale ethnic cleansing. In the course of which thousands of Jews and Christians were driven from their homes, deported and killed. They had to make room for an experiment of racism. In the west of Poland, the Nazis a "blonde provincial planning" should grow up settling ethnic German, the offspring of a Germanic master race.