Thomas J. Sugrue is the David Boies Professor of History and Sociology at the University of Pennsylvania. His most recent book is "Not Even Past: Barack Obama and the Burden of Race."

In 1973, my parents sold their modest house on Detroit’s West Side to Roosevelt Smith, a Vietnam War veteran and an assembly-line worker at Ford, and his wife, Virginia (not their real names). For the Smiths—African Americans and native Mississippians—the neighborhood was an appealing place to raise their two young children, and the price was within their means: $17,500. The neighborhood’s three-bedroom colonials and Tudors, mostly built between the mid-1920s and the late ’40s, were well maintained, the streets quiet and lined with stately trees. Nearby was a movie theater, a good grocery store, a local department store, and a decent shopping district. Like many first-time home buyers, the Smiths had every reason to expect that their house would be an appreciating investment.

For their part, my parents moved to a rapidly growing suburb that would soon be incorporated as Farmington Hills. Their new house, on a quiet, curvilinear street, was a significant step up from the Detroit place. It had four bedrooms, a two-car attached garage, and a large yard. It cost them $43,000. Within a few years, they had added a family room and expanded the small rear patio. Their subdivision, like most in Farmington Hills, was carefully zoned. The public schools were modern and well funded, with substantial revenues from the town’s mostly middle- and upper-middle-class taxpayers. All of the creature comforts of the good suburban life were close at hand: shopping malls, swim clubs, movie theaters, good restaurants....

For the Smiths it was a far different story. Detroit had been losing population since the 1950s, and especially after the 1967 riots there was massive “white flight” from the city. The neighborhood in which the Smiths invested went from mostly white to black within a few years, along with the rest of Detroit. For the city as a whole, those who remained were not as well off on average as those who left, meaning that even as the tax base shrank, the demand for city services went up, setting off a vicious death spiral. Soon, schools and infrastructure groaned with age, and the city’s tax base shrank further as businesses relocated to suburban office parks and shopping centers. By the end of the ’70s, the decline of the auto industry and manufacturing generally compounded Detroit’s woes, as production shifted to Japan or the South in search of cheaper labor and fewer regulations....