The contributors to this volume probe systematically and in depth the adaptation patterns and trajectories of concrete ethnic groups. They provide a close look at this rising second generation by focusing on youth of diverse national origins—Mexican, Cuban, Nicaraguan, Filipino, Vietnamese, Haitian, Jamaican and other West Indian—coming of age in immigrant families on both coasts of the United States. Their analyses draw on the Children of Immigrants Longitudinal Study, the largest research project of its kind to date. Ethnicities demonstrates that, while some of the ethnic groups being created by the new immigration are in a clear upward path, moving into society's mainstream in record time, others are headed toward a path of blocked aspirations and downward mobility. The book concludes with an essay summarizing the main findings, discussing their implications, and identifying specific lessons for theory and policy.