Urban ecology explores the causes and consequences of hybrid ecological-social relationships in cities, suburbs, towns, and exurbs, along with their connections to the ecologies of distant ecosystems. These systems frequently exhibit widespread and often extreme spatial segregation among people assigned to or identifying as different racial categories. The science of ecology has paid scant attention to this conspicuous social heterogeneity. However, accumulating evidence shows segregation to be persistent over time, and even globally widespread based on various categories. This talk uses the adaptive cycle of resilience, a concept from complex systems theory, to understand the persistence of racialized segregation in Baltimore MD as an ecological factor. The talk briefly highlights the ecological correlates of spatial segregation among racialized groups, shows how segregation at various scales was periodically threatened by social and legal dynamics, how the established power structure reacted to preserve and extend racialized segregation, and consequently its unjust environmental consequences. The research horizon thus indicated is a broad and open one.