In recent decades, the clustering of rich and poor neighborhoods in America has continued, expanding inequality.

Many recent discussions on American cities and neighborhoods have focused on how they are changing, either through gentrification or economic change. In new research, Elizabeth Delmelle finds that gentrification is only one small part of the story of America's neighborhoods since 1980. She writes that the highest poverty, majority black neighborhoods and the wealthiest and whitest neighborhoods have been relatively ...