The party line was that the Jews were the instigators of the partisan struggle and therefore needed to be eliminated. Göring, having stripped almost all of occupied Poland of its artworks within six months of Germany's invasion, ultimately grew a collection valued at over 50 million Reichsmarks. In the midst of the Great Depression, the Nazis restored economic stability and ended mass unemployment using heavy military spending and a mixed economy. Further elections in November 1933, 1936, and 1938 were Nazi-controlled, with only members of the nsdap and a small number of independents elected. A total of 23,000 Romani were deported to Auschwitz concentration camp, of whom 19,000 died. However, expression of Nazi views was frowned upon, and those who expressed such views were frequently dismissed from their jobs. When the other European powers failed to accept this offer, Hitler pulled Germany out of the World Disarmament Conference and the League of Nations in October, claiming its disarmament clauses were unfair if they applied only to Germany. The curriculum in most subjects, including biology, geography, and even arithmetic, was altered to change the focus to race. In 1940, the Reichsleiter Rosenberg Taskforce was established to loot artwork and cultural material from public and private collections, libraries, and museums throughout Europe. Persecution of the Catholic Church in Germany followed the Nazi takeover.