A new study by researchers at the University of Maryland, Baltimore County finds that these "inner suburbs," which boomed after World War II, are now struggling with stagnation and decline, increasing poverty and deteriorating infrastructure as jobs and younger, more-affluent families have tended to migrate to the outer suburbs over the past 25 years. The study, by UMBC's Center for Urban Environmental Research and Education, calls for greater public and private reinvestment in these aging communities to stem the loss of open land and increasing traffic congestion as the region's suburbs keep spreading outward. Analyzing census data from 1980 through...