When Hitler marched into Austria in March 1938, the country's Jewish population numbered nearly 200,000. Those Jews who were able to find refuge in neutral countries were safe; those who fled to countries subsequently overrun by the Nazis were eventually hunted down. Between 1938 and 1945, more than 50,000 Austrian Jews were deported; no more than 2,000 returned. The estimate of Jews caught by the Nazis in neighboring countries is 17,000. Therefore,...