"Comprehensive study combines historical analysis, case study of a community in Guanajuato, and results of over 2,000 questionnaires from 11 communities in western Mexico, to explore patterns and cultural and economic impact of migration. Finds that migration has become a geographically and socioeconomically generalized phenomenon and that young people from poor neighborhoods and women have emerged as new migratory populations. Examines cultural impact of migration on children. Also discusses intended and unintended effects of Simpson-Rodino law"--Handbook of Latin American Studies, v. 57.