"Guests and Aliens" presents a comprehensive analysis of worldwide immigration by one of the world s leading experts on globalization. Putting the current crisis of immigration into a historical context for the first time, Sassen suggests that the American experience represents only one phase in a history of global border crossing. She describes the mass migrations of Italians and Eastern European Jews during the nineteenth and early twentieth centuries and the international dislocations particularly after the end of World War II that have engendered the refugee concept. Using these...