Suggested readings on white flight and urban sprawl:

Sprawl and segregation:  A study of U.S. metropolitan areas 

Len Sprishen
Senior Economics Thesis
The College of New Jersey

"While it may be difficult in practice to separate white flight from the various definitions of sprawl, some contend that the consequences are the same: an isolated base of blacks and Hispanics develops in central city neighborhoods and declining suburbs. These individuals are unable to develop wealth through home ownership, due to the falling property values or lack of access to credit. The result of this isolation results in chronic unemployment, failing schools, and increased crime (Orfield, 1999).
The purported effects of sprawl have created great problems in housing, both in costs and in decreased homeownership. Blacks and Hispanics are increasingly left in the urban core, and as bigger and bigger homes continue to be built in the suburbs, the opportunities for the former groups to own a home and increase their wealth are very infrequent."

Negative Effects of Urban Sprawl
by Leonardo R. Grabkowski, Demand Media

"When residents relocate outside of a city’s core, they take their tax dollars with them. Often, it’s the city’s poorest residents that are left behind. This creates economic disparity and stratification based upon location. It also creates funding problems for the core, which directly affects the money available for education, crime prevention, and maintenance and upkeep. Urban sprawl can also lead to economic “white flight.” According to “Urban Sprawl: A Reference Guide,” urban sprawl leads to racial segregation as minorities are often left behind in the poorest parts of a region. This problem may not be as widespread as it has been in the past, but it's present nonetheless."

Urban Sprawl on Wikipedia