Sam2, Derszoger, A few comments. First, by almost all accounts, there were about 12 million Jews in Europe and the Soviet Union pre war, and about 18 million Jews in the world overall.
Second, Sam, Derszoger is partially right. By 1938, the western countries had effectively closed their doors to Jewish immigration. The notorious Evian conference detailed their refusal to allow for more than a small number of Jewish European emigrants and refugees. However, Between Hitler’s rise to power in 1933 and late 1937 when the doors began to close more and more, there were opportunities to leave; And it was less difficult to get into Mandate Palestine before 1937 as well.