Immigration theory for a new century: some problems and opportunities.

"This essay examines some of the pitfalls in contemporary immigration theory and reviews some of the most promising developments in research in this field. As a data-driven field [of] study, immigration has not had to contend with grand generalizations for highly abstract theorizing. On the contrary, the bias has run in the opposite direction, that is toward ground-level studies of particular migrant groups or analysis of official migration policies. As the distillate of past research in the field and a source of guidance for future work, theory represents one of the most valuable products of our collective intellectual endeavor. Ways to foster it and problems presented by certain common misunderstandings about the meaning and scope of scientific theorizing are discussed." The geographical focus is on the United States.