It is widely believed that only the growth of mass suburbs after World War II brought suburban living within reach of blue-collar workers, immigrants, and racial minorities. But in this original and intensive study of Toronto, Richard Harris shows that even prewar suburbs were socially and ethnically diverse, with a significant number of lower-income North American families making their homes on the urban fringe. In the United States and Canada, lack of planning set the stage for a uniquely North American tragedy. Unplanned Suburbs serves as a reminder of the dangers of unchecked suburban growth.