Editor’s Note: This article is adapted from remarks delivered by the author on March 16 at the University of Arkansas’s Clinton School of Public Service, in Little Rock.

Little Rock is a fascinating city. With its river and renovated warehouses and bustling River Market district, it reminds me a little bit of Pittsburgh, where I lived a decade ago when I was starting my journalism career. At that time, Pittsburgh was still the butt of many jokes, though determined city planners were starting to drive the transformation that’s made it so popular. Today, there’s a growing population downtown and tech companies are locating in the city once known for steel.

It’s a funny thing about cities: They’re all unique, but they sometimes experience busts and booms in the same way. Just look at all the cities across the country that are experiencing a craft-beer renaissance and have condos in renovated warehouses downtown.

Perhaps that’s why policymakers in the 1940s and 1950s thought of cities as human bodies, bodies that had sicknesses and required cures. Bodies that got sick from the same diseases and would improve from the same medicine.

The postwar years were a time of unprecedented prosperity, when Americans were buying refrigerators and televisions and homes, and wanted to leave the crowded heart of city centers for space to put all their new belongings. The rise of the automobile helped them do this. In 1940, 60 percent of Americans owned cars. In 1960, 80 percent did. Today, 95 percent of Americans own cars.

This increase of people heading to the suburbs in their cars caused something else new: lots and lots of traffic. And to city planners, this was making communities unhealthy. By the 1950s, highways were being recommended as “the greatest single element in the cure of city ills,” according to Joseph DiMento, an Irvine professor who has studied highway construction during that era. To keep cities healthy, planners said, regions needed unclogged arteries for a working circulatory system. In short, cities needed highways to carry people out of the heart and to the rest of the body.

Luckily for city planners who wanted to keep their cities healthy, there was federal money available to anyone who wanted to put in modern highways. While the 1944 Federal Highway Act only offered to cover 50 percent of construction costs for highways, by 1956, the federal government had upped that share to 90 percent. So if you’re a city planner in the 1950s, you can put in roads from your city to the fast-growing suburbs for almost no cost at all.

Of course, there were people who couldn’t move to the suburbs. African Americans were denied home loans by the federal government in certain areas, a practice called redlining. Restrictive covenants prevented homeowners from selling to certain types of people, often including African Americans. And they were also denied jobs and other opportunities that would have allowed them to afford to buy a home in the first place. When I was in Syracuse, I met a man named Manny Breland, who received a scholarship to play basketball at Syracuse, graduated with a teaching degree, and was denied job after job because he was black.

In many cities, these restrictions left African Americans crowded into small neighborhoods. They essentially weren’t allowed to move anywhere else.

City planners had a solution for this, too. They saw the crowded African American areas as unhealthy organs that needed to be removed. To keep cities healthy, planners said, these areas needed to be cleared and redeveloped, the clogged hearts replaced with something newer and spiffier. But open-heart surgery on a city is expensive. Highway construction could be federally funded. Why not use those federal highway dollars to also tear down blight and rebuild city centers?

The urban planner Robert Moses was one of the first to propose the idea of using highways to “redeem” urban areas. In 1949, the commissioner of the Bureau of Public Roads, Thomas MacDonald, even tried to include the idea of highway construction as a technique for urban renewal in a national housing bill. (He was rebuffed.) But in cities across America, especially those that didn’t want to—or couldn’t—spend their own money for so-called urban renewal, the idea began to take hold. They could have their highways and they could get rid of their slums. With just one surgery, they could put in more arteries, and they could remove the city’s heart.

This is exactly what happened in Syracuse, New York. The city had big dreams of becoming an East Coast hub, since it was close to New York City, Pittsburgh, Cleveland, and Boston. (In the early days of the car, close was relative.) Use federal funds to build a series of highways, planners thought, and residents could easily get to the suburbs and to other cities in the region. After all, who wouldn’t want to live in a Syracuse that you could easily leave by car? And, if they put the highway in just the right place, it would allow the city to use federal funds to eradicate what they called a slum area in the center city.

That neighborhood, called the 15th Ward, was located between Syracuse University and the city’s downtown. It was predominantly African American. One man who lived there at the time, Junie Dunham, told me that although the 15th Ward was poor, it was the type of community that you often picture in 1950s America: fathers going off to jobs in the morning; kids playing in the streets; families gathering in the park on the weekends or going on Sunday strolls. He remembers collecting scraps from the streets and bringing them to the junkyard for pennies, which he would use to buy comics.

To outsiders, though, the 15th Ward was the scene of abject poverty close to two of Syracuse’s biggest draws—the university and downtown. They worried about race riots because so many people were crowded into the neighborhood and prevented from going anywhere else. They decided that the best plan would be to tear down the 15th Ward and replace it with an elevated freeway.   

The completion of the highway, I-81, which ran through the urban center, had the same effect it has had in almost all cities that put interstates through their hearts. It decimated a close-knit African American community. And when the displaced residents from the 15th Ward moved to other city neighborhoods, the white residents fled. It was easy to move. There was a beautiful new highway that helped their escape.

But this dynamic hurt the city’s finances, too. As suburbs grew, they broke off from cities, taking with them tax revenues, even though their residents still used city services. Although the Syracuse region was relatively healthy, the city started to get very sick.

Between 1940 and 2000, the population of the city of Syracuse shrank 30 percent, from about 205,000 to 147,000. The population of Onondaga County, where Syracuse is located, grew 55 percent, from 295,000 to 458,000.

Even today, the region is continuing to sprawl. The population of Onondaga County peaked in 1970 and has stayed even since then. But residents are moving farther and farther out. The county has added 7,000 housing units, 147 subdivisions, and 61 miles of new roads since 2000. Developers build 160 units a year in areas that were once rural. That’s costing the county money and resources as it adds sewer systems, water pipes, and stormwater drainage to far-flung subdivisions. As the county spends money, the city is struggling to come up with enough revenue for essential things like mass transit and schools.

What’s more, as the suburbs grow, they’re continuing to make sure that only wealthy people can live there. They pass zoning laws that restrict multifamily units. They require minimum lot sizes so that their only residents are people who can afford to live in big houses. It’s a different kind of discrimination than half a century ago, but discrimination nonetheless.

Today, the city of Syracuse has the highest concentration of poverty in America. What that means is that large proportions of its population live below the federal poverty line, and that they’re surrounded by other poor people, too. Nearly two-thirds of the black poor live in high-poverty neighborhoods in Syracuse. Around 62 percent of the Hispanic poor live in high-poverty neighborhoods.

Of course, the highway isn’t the only reason there’s so much concentrated poverty in Syracuse. The economy has changed, and big employers such as the Carrier Corporation and other manufacturing companies have left for overseas. Wages in Syracuse and across America have remained stagnant, so even those people who are employed are finding it is much harder to make ends meet than it used to be.

Ironically, the people who are left in Syracuse now live in more concentrated poverty than the people of the 15th Ward, which city leaders saw as so blighted decades ago.

This is bad for the health of the region. We know that people who live in concentrated poverty have a much harder time succeeding because they’re surrounded by other poor people. The economist Raj Chetty made this very clear in a series of papers he’s published in the last two years through the Equality of Opportunity project. He found that neighborhoods matter, and that a low-income child who is born in certain low-income neighborhoods has a much smaller shot of achieving upward mobility than a low-income child born in a better neighborhood.

Now, there are programs that move poor families from areas of concentrated poverty to wealthy suburbs. I’ve written about some of them. Children thrive when they’re taken out of housing projects and moved to condos where there are trees, parks, places to ride their bikes, and good schools nearby. But it’s not realistic to move every family to a different neighborhood, and besides, many people don’t want to move.

What does work, though, is bringing cities together so that poverty isn’t so concentrated, so that the rich can’t just leave or wall themselves off from the poor, so that the poor aren’t trapped in areas of concentrated poverty—what people used to call slums.

* * *

In the last decade, Americans’ ideas of where they want to live have been changing. Young professionals and Baby Boomers are moving back to inner cities, fueled by the desire to live somewhere walkable, near restaurants, bars, and offices, where they don’t need to have cars. A freeway passing through the heart of a city does not jibe very well with an urban renaissance.

After all, walkable cities where people want to live probably don’t also have noisy highways that create physical and psychological rifts that are extremely difficult to bridge.

In some cities, planners have decided to help that urban renaissance and tear down the freeways that seemed like a good idea in the 1950s.

Boston tore down its Central Artery in its famous Big Dig, turning a waterfront area of the city that had long been clogged with traffic into a popular park and walking area. Milwaukee demolished the Park East freeway in 1999 and urban development has blossomed in the neighborhoods created by the highway’s removal. Manpower Corporation moved its headquarters to the area, and the average assessed land value there grew 45 percent. The economically depressed town of New Haven is in the midst of a project called Downtown Crossing, which has removed parts of Route 34 and is creating a business district in an area of town bisected by the freeways.

Even some people in Syracuse want to tear down I-81. Like many highways built by idealistic planners in the 1950s, I-81 is reaching the end of its useful life, according to engineers. It isn’t wide enough to meet current highway standards, and parts of it are literally falling apart. Some urban planners want to tear it down to create an urban boulevard. For more than half a century, the road has divided the city, they say, and it’s time to knit it together back again.

Some cities are taking the opposite approach. Alabama’s highway department is seeking to widen parts of a highway that bisect Birmingham, Alabama, though the proposal faces opposition from business leaders. Florida’s highway department declined to tear down a highway in Miami called the Overton Expressway.

In the 1950s, when so many highways were built, planners across the country wanted to help citizens access the prosperity that seemed accessible to everyone in the postwar years. But starting with the exodus to the suburbs around that time, and continuing to this day, prosperity has been out of reach for many Americans.

If part of a body is sick, the whole body can’t be healthy, and many cities across America have parts that aren’t doing very well. But there are regions that are trying to become healthier by coming together, rather than pulling apart. Tearing down a highway can be one way to do this. But it’s not the only way. My colleague Derek Thompson has written about the miracle of Minneapolis, where high-income communities share tax revenues and real estate with lower-income communities to spread prosperity. A year ago, I visited Louisville, where a court ordered the county and city to combine their school districts in order to integrate their schools. Today, Louisville is still trying to keep its county and city schools integrated, even after the Supreme Court told the city it no longer had to do so. In Chicago, a regional housing authority that covers eight counties, including Cook County, is working to move families from the inner city to higher-opportunity neighborhoods. Some cities use inclusive zoning, in which all new construction must include a certain percentage of housing for low-income residents, which means that the wealthy can’t separate themselves from the poor.

These cities have tried to tear down barriers that prevent all of their residents from reaching their full opportunity. Sometimes those barriers are highways. Sometimes they’re something else entirely. Tearing down a highway isn’t the only way to make a city healthy again. But building a new one—or expanding an existing one—seems a surefire way to make a city sick.