Alana Semuels, The Atlantic, April 10, 2015

Last summer, the Michigan town of Grosse Pointe Park erected a farmer’s market in the middle of one of the few remaining streets that allowed cars to pass between the tony suburb and the urban Detroit neighborhoods at its border. It was the latest of many attempts by Grosse Pointe Park residents to close off roads and block traffic between what has become a predominantly white, affluent suburb, and its poorer, urban neighbor.

There were protests about the border, and Grosse Pointe Park later said it would tear down the farmer’s market and re-open the road, but the incident speaks volumes to the segregation that exists in Detroit, and the tensions that can grow as a result.

The fact that these two areas are so close is unique–the border between Grosse Pointe Park and the city of Detroit is the only place in any of America’s biggest cities where a very wealthy, predominantly-white area abuts a very poor, black one, according to research from a new working paper from the University of Minnesota. But the existence of self-segregated wealthy white areas close by low-income minority ones isn’t unique, according to the Minnesota researchers. They have sorted census tracts in 15 of America’s 20 biggest cities into “racially concentrated areas of affluence” and “racially concentrated areas of poverty,” and find that many cities have more areas of segregated affluence than they do poverty.

Racially concentrated areas of affluence, by the researchers’ definition, are census tracts where 90 percent or more of the population is white and the median income is at least four times the federal poverty level, adjusted for the cost of living in each city. Racially concentrated areas of poverty, by contrast, are census tracts where more than 50 percent of the population is non-white, and more than 40 percent live in poverty.

Detroit has 55 racially concentrated areas of affluence and 147 racially concentrated areas of poverty, according to the research, done by Ed Goetz, Tony Damiano, and Jason Hicks. Detroit’s racially concentrated areas of affluence are just 1.1 percent black. Its racially concentrated areas of poverty, by contrast, are 76 percent black.

Cities such as St. Louis, Boston, Baltimore, and Minneapolis have more racially concentrated areas of affluence (RCAAs) than they do racially concentrated areas of poverty (RCAPs). Boston has the most RCAAs of the cities they examined, with 77. St. Louis has 44 RCAAs, and 36 RCAPs. Other cities with a large number of racially concentrated areas of affluence include Philadelphia, with 70, Chicago, with 58, and Minneapolis, with 56.

In Boston, 43.5 percent of the white population lives in census tracts that are 90 percent or more white and have a median income of four times the poverty level. In St. Louis, 54.4 percent of the white population lives in such tracts.

Still, it’s the poor areas, rather than the areas where whites have self-segregated, that get the most attention from policymakers, who have sought to ameliorate concentrated poverty in segregated areas by moving families from black, urban areas to white suburbs. {snip}

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Public policy has “focused on the concentration of poverty and residential segregation. This has problematized non-white and high-poverty neighborhoods,” said Goetz, the director of the Center for Urban and Regional Affairs at the University of Minnesota, when presenting his findings at the Lincoln Institute of Land Policy. “It’s shielded the other end of the spectrum from scrutiny–to the point where we think segregation of whites is normal.”

Goetz and his team are still researching the effects of this self-segregation of whites, but he thinks that a high number of RCAAs may be a negative factor for cities.

“Some people argue that when whites and affluent people segregate themselves, it can erode empathy, and it can inhibit the pursuit of region-wide remedies,” he told me. “It can inhibit a sense of shared destiny within a metropolitan area.”

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Goetz and his team also researched the RCAAs’ and RCAPs’ distance to downtown. Areas of affluence are located, on average, 21.1 miles from a metro area’s downtown. In Detroit, racially concentrated areas of affluence are, on average, 24.2 miles from the city’s downtown. In Washington, D.C., racially concentrated areas of affluence are 25.1 miles from downtown; in Chicago, they’re 22.1 miles. Racially concentrated areas of poverty, on the other hand, are on average 6.6 miles from downtown, and in cities such as Baltimore, St. Louis, and Philadelphia, they’re much closer.

There is less self-segregation of metro areas in the West: San Francisco and Houston have just five racially concentrated areas of affluence each, Seattle has nine, Los Angeles, 11. Seattle has just six racially concentrated areas of poverty and San Francisco has 12. These western cities have larger populations of affluent minorities, and are, in general, more diverse. Only 1.1 percent of affluent households live in RCAAs in San Francisco and only 3.1 percent do in Seattle, but in St. Louis, by contrast, 23.1 percent of affluent households live in a racially concentrated area of affluence. {snip}

The racial makeup of concentrated areas of poverty differs between regions, too: they’re predominantly black in Atlanta, Baltimore, Chicago, Detroit, St. Louis, Philadelphia, and Washington, predominantly Latino in Houston and Los Angeles, and mixed in Boston, Minneapolis, and San Francisco.

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