tsharer:
1. That letter was written PRIOR to Poland being invaded by Germany and the Soviet Union. As much war rattling as there was, prior to Sept. 1939 no one could have KNOWN what was destined to transpire in Poland, as it was NOT at war yet. (Indeed Germany and Poland were bound by the German-Polish Non-Aggression Pact of 1934.)
2. NOWHERE in that letter does it indicate that Rabbi Wasserman’s entire Yehsiva was offered Visa’s to America as you alleged above.