The following passage is excerpted from The Failures of Integration: How Race and Class Are Undermining the American Dream. (For more on this issue, read an interview with the author.) The growing concern with sprawl creates an interesting possibility for alignment of urban and suburban, white and minority, affluent and poor interests. Advocates for low-income people and for cities and older suburbs need to be much more involved in the smart-growth and sustainable-development movements. It is highly relevant, and even more important to expanding opportunities and choices for low-income minorities. Steering growth to the urban core has a number of …