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In this essential companion to The Abandonment of the Jews, David S. Wyman examines American policy on refugees in the years leading up to World War II. For almost four agonizing years, from 1938 through 1941, German Jews tried to leave their country. Barred from the United States by restrictive immigration policies, millions ultimately were killed, and a mere 150,000 finally found haven in this country. How could such a tragedy have come about? Wyman's answer is that America's public resistance had four bases: unemployment, nationalism, anti-Semitism, and later, fear of fifth columnists…