Boston's Beacon Hill, Chicago's South Side, San Francisco's Chinatown and Castro, Miami's Little Havana, Detroit's Near East Side, and New York's Crown Heights are all neighborhoods that evoke strong images of residents who share common ethnic, racial, religious, social class, or lifestyle ties. How do communities like these form in diverse urban areas and why? What are the forces that conspire to segregate people? Mark Abrahamson explores these questions while providing a lively history of these urban enclaves.