Start with the line nobody could see, because it was still enforced. On July 27, 1919, Eugene Williams, a 17-year-old Black teenager, was swimming on a raft at Chicago's 29th Street Beach when he crossed the invisible boundary separating the beach's informally white and Black sections.[1] A white man, George Stauber, threw stones at him until he fell off the raft and drowned. The first police officer to arrive at the scene refused to arrest Stauber.[1] What followed was the largest race riot Chicago has ever seen -- a week of violence, July 27 to August 3, that killed 38 people and injured hundreds more.[1] The line that killed Eugene Williams was never written down anywhere. Everyone on that beach already knew exactly where it was.
Forty-two years later, the city didn't erase that line. It poured concrete on top of it. The Dan Ryan Expressway was originally planned to run through Bridgeport, Mayor Richard J. Daley's own neighborhood.[2] It was rerouted eight blocks east instead, installing a multi-lane highway barrier directly between Bridgeport and the Black Belt.[2] Construction ran 1961-1962 and cost more than $282 million -- nearly $2.6 billion today -- and displaced thousands of residents from neighborhoods including Bronzeville and Woodlawn.[2] Black residents made up 64% of everyone displaced by Chicago's expressway construction citywide, despite being only 23% of the city's population at the time.[2] A decision about where to route a highway is, on paper, an engineering choice. This one moved eight blocks specifically to avoid the mayor's own street and land on someone else's instead.
The public housing that followed didn't sit near the new boundary. It was built directly against it, on purpose. In 1962, the Robert Taylor Homes -- at the time the largest public housing project in the United States -- rose as 28 high-rise towers stretching two miles along the Dan Ryan, replacing what had been known as the Federal Street slum.[2] Some of the residents moved into the towers had already been displaced once before, by the construction of an earlier housing project, Stateway Gardens.[2] The highway that had just been rerouted to protect Bridgeport now had 28 towers of concentrated public housing running along its entire eastern edge -- the boundary and the population it separated, built in the same decade, by the same city government.
A century after the beach, the same distinction is no longer enforced by a mob or a highway. It shows up in a single, measured number. A 2019 NYU School of Medicine study, using CDC data from 2010 to 2015 across America's 500 largest cities, found the single largest neighborhood-level life-expectancy gap anywhere in the country inside Chicago itself: Streeterville residents live to an average of 90 years old; Englewood residents, roughly 60.[3] The two neighborhoods sit nine miles apart.[3] Nobody has to draw a line in the water or reroute a highway for a distinction like that to hold. By the time it shows up as a life-expectancy statistic, the line has already done its work for a hundred years without needing to be redrawn once.
The same South Side that produced that number also shaped a president -- and he came to it from as far away as the country actually gets. Barack Obama was born in Honolulu, Hawaii in August 1961, graduated Punahou School there in 1979, then went to Occidental College in Los Angeles and Columbia University in New York before arriving in Chicago in 1985 at 23 or 24, specifically to take the Developing Communities Project job.[4] From June 1985 to May 1988 he directed that church-based organization across Roseland, West Pullman, and Riverdale on the far South Side -- part of the work was building a tenants' rights organization inside the Altgeld Gardens public housing projects, the same kind of concentrated, disinvested public housing the Dan Ryan's rerouting helped produce elsewhere in the city.[4] He wasn't native to the ground this piece has been tracing. He chose it, at 24, having grown up literally as far from it as Hawaii is from Illinois, and the organizing skill he built on those specific streets carried directly into the political career that reached the presidency. The distinction this piece traces isn't a story where the South Side only loses. It's a story where the same ground that measurably shortens lives is also the ground someone crossed an entire country to work on, and where doing exactly that work became the foundation of the most powerful elected office in the country -- both real, at once, neither one erasing the other.