In the years preceding, Casablanca had evolved from an exotic travel destination to a key military target after France's surrender to Germany. Jewish refugees from Europe poured in, hoping to obtain visas and passage to the United States and beyond. Nazi agents and collaborators infiltrated the city in search of power and loyalty. The resistance was not far behind, as shopkeepers, celebrities, former French Foreign Legionnaires, and disgruntled bureaucrats formed a network of Allied spies. But once in American hands, Casablanca became a crucial logistical hub in the fight against Germany--and the site of Roosevelt and Churchill's demand for "unconditional surrender."