Many Americans think of their country as a welcoming "nation of immigrants," yet our communities have a long history of ambivalence toward new arrivals and racial minorities. This is often expressed through segregation by race and income. In this book, some of the nation's leading analysts and advocates show why segregation persists and how it undermines education, job prospects, and even health and safety for millions of minorities and low-income families. Calling housing "the most important invisible social policy issue in America," the book outlines and agenda to expand the geography of opportunity and assesses the political promise—and limits—of the movement for regional solutions. This project was sponsored by the Civil Rights Project at Harvard University in collaboration with Harvard's Joint Center for Housing Studies at the Brookings Institution's Metropolitan Policy Program.