Once the “Final Solution” began and the Nazi death camps were in full operation, Jews and other targets of the Nazi regime could only leave the country with the help of forged passports or other documents. Within Germany itself, this was extremely difficult, and the possession of any such documents would result in summary execution.
Are you talking about the Holocaust because they didn't leave,The jews either died or escaped. "As Soviet troops entered the heart of Berlin, Hitler killed himself on April 30, 1945, in his underground bunker". The soviet troops freed the Jews.
The Songhai empire was where islam flourished and in places like the port city of Timbuktu, many Islamic schools and Mosques were built for the increasing population.
