Invasion and Succession in Urban Sociology: Dynamics of Neighborhood Change

Every city is a living, shifting landscape. Neighborhoods that were once home to one community can, within a generation, become the domain of an entirely different population. This is not accidental – it follows recognizable patterns that urban sociologists have studied for over a century. Two of the most important of these patterns are invasion and succession: the processes by which one social group moves into urban space previously occupied by another, gradually transforming its character. Understanding these processes is essential to making sense of how cities grow, change, and sometimes fracture along lines of class, ethnicity, and economic power.

The Chicago School and the ecological view of cities 🔗

The concepts of invasion and succession were first systematically developed by sociologists at the University of Chicago in the early 20th century, a group known as the Chicago School. These scholars approached the city as an ecosystem – a living environment in which different social groups compete for space and resources, much like organisms in nature. Robert Park and Ernest Burgess were central figures in this tradition. They applied principles borrowed from plant and animal ecology – particularly competition, dominance, and succession – to explain how human communities form, shift, and reorganize within urban space.

Robert E. Park, who joined the University of Chicago’s Department of Sociology in 1914, became a pivotal figure in advancing human ecology, which applied principles of plant and animal ecology – such as invasion, succession, and competition – to explain human community organization. This ecological lens gave sociologists a vocabulary to describe neighborhood change in spatial terms, linking population movement to physical space in ways that earlier, more abstract theories had not.

The concentric zone model: a spatial map of urban change 🔗

The concentric zone model, also known as the Burgess model, is one of the earliest theoretical models to explain urban social structures. It was created by sociologist Ernest Burgess in 1925 and was the first to explain the distribution of social groups within urban areas. The model divides a city into a series of rings radiating outward from the city center, each with distinct social and economic characteristics.

The model assumes a relationship between the socio-economic status of households and the distance from the Central Business District (CBD). The further from the CBD, the better the quality of housing, but the longer the commuting time. At the core sits the Central Business District, home to commerce and employment. Surrounding it is the Zone of Transition – a critical area where residential properties deteriorate as lower-income groups move in, creating a mix of housing types and social pressures. Working-class, middle-class, and commuter zones spread outward from there.

The concentric model is built on a process of invasion and succession. Invasion is a process that necessarily states that the continuous extension of inner zones into outer zones as a result of the inherent movement of migrants into the metropolis, while succession occurs when a region becomes dominated by the activity entering that zone. The model, while developed specifically to explain Chicago’s growth in the early industrial era, provided a foundational framework that shaped urban sociology for decades to come.

What invasion and succession actually mean 🔗

The invasion-succession model is a sociological framework initially developed in the context of urban ecology to explain the processes of demographic and social changes in neighborhoods. It draws upon ecological metaphors from the study of plant and animal communities to describe how different social groups move into and dominate particular urban areas, often displacing previous inhabitants.

The invasion stage 🔗

Invasion refers to the entry of a new social or ethnic group into a neighborhood previously dominated by another. This process is typically driven not by conflict but by practical necessity – the search for affordable housing, proximity to employment, access to transportation, or escape from overcrowded conditions elsewhere. The Chicago sociologists recognized that change in local population composition is a major mechanism by which natural areas change, and developed the invasion-succession model to capture the main processes by which one population supplanted another and one social system replaced its predecessor.

A typical example from American urban history involves immigrant communities arriving in industrial cities and settling in the Zone of Transition, where rents were cheapest. Burgess documented in Chicago’s historical data how waves of European immigrants from 1880 to 1920 sequentially occupied inner rings, displacing prior residents and perpetuating a cycle of ecological adjustment until equilibrium in each zone.

The succession stage 🔗

Succession follows when the incoming group becomes dominant in the neighborhood. The process of succession often transforms the character of a neighborhood. As the new group takes root, it establishes its own social networks, businesses, and institutions. These changes may alter the built environment, including architecture, retail options, and community spaces, to better suit the cultural preferences of the new population. Over time, the neighborhood becomes associated with the new group, and earlier residents either relocate to other zones or are absorbed into the changing community.

It is worth noting that succession was historically treated as a one-directional, almost inevitable process. Studies from the 1950s through the 1970s documented transitions from white to black occupancy that, in line with invasion-succession logic, were regarded as natural and irreversible. However, later scholars challenged this view, arguing the model was more descriptive than explanatory – it identified what happened without fully accounting for why.

Racial and ethnic dimensions of neighborhood change 🔗

The concept of invasion-succession has most often been used to understand neighborhood racial change. In the United States especially, the model illuminated patterns of racial residential sorting that were deeply tied to discrimination, housing policy, and institutional decision-making – not simply to the neutral ecological forces Burgess described.

Research published in the American Journal of Sociology by Logan and Zhang found that in multiethnic metropolitan regions, a newer pathway of neighborhood change had emerged – what they called “global neighborhoods.” In multiethnic metropolitan regions there is an emerging pathway of change that leads to relatively stable integration. These are “global neighborhoods” where Hispanics and Asians are the pioneer integrators of previously all-white zones, later followed by blacks. However, region-wide segregation is maintained at high levels by whites’ avoidance of all-minority areas and by their continued exodus from mixed settings.

This research suggests that invasion and succession do not always follow a single racial binary – the model must account for multiethnic dynamics that older frameworks were not designed to capture.

Housing markets and institutional forces 🔗

One of the most significant critiques of the invasion-succession model is its tendency to treat neighborhood change as a natural, spontaneous ecological process – when in reality, it is heavily shaped by institutional decisions. What may appear to be a process governed by alleged principles of invasion and succession is actually a set of changes fueled by decisions made by housing market actors. The focus on how housing market institutions affect neighborhoods is important largely because these decisions can be changed.

Real estate practices such as blockbusting – where agents deliberately triggered white flight by introducing or threatening Black occupancy in a neighborhood – manipulated succession for profit. Recent urban scholarship has questioned the validity, methodology, and assumptions of the invasion-succession model of neighborhood racial transition, identifying key actors, organized interests, and institutional forces that the model neglected to incorporate. This means that what looked like ecological inevitability was, in many cases, a manufactured outcome.

Gentrification: a new form of succession 🔗

From the late 20th century onward, gentrification has become one of the most visible and contested expressions of invasion and succession in cities around the world. Gentrification refers to the migration of affluent households to poorer and lower-value areas of urban and rural settlements. As wealthier residents move in, property values rise, local services change, and original residents – typically lower-income communities – face displacement.

As industry and occupational choice evolve over time – from agricultural, to industrial, to service-based, to information-based – we can expect the character of our cities to evolve accordingly. This happens in many ways: physically, in the demolition of factories and subsequent erection of high-rise office buildings; and demographically, in the influx of sector professionals seeking access to city housing.

Research from the National Institutes of Health on gentrification across 23 U.S. cities found that low-income minority neighborhoods generally remained isolated and often disadvantaged amid the expansion of gentrification, leaving these neighborhoods particularly vulnerable, especially in cities with tight housing markets. As some low-income neighborhoods with particular characteristics garner investment, others tend to remain left behind, perpetuating and increasing neighborhood inequality.

The global dimension: local neighborhoods, world forces 🔗

Invasion and succession are no longer purely local phenomena – they are driven by forces that operate at a global scale. International migration, foreign real estate investment, and transnational capital flows now shape neighborhood composition in cities from New York to Mumbai to Seoul.

Higher-income lifestyle migrants and tourists have led to a globalization of rent gaps, transforming urban spaces in lower-income countries as they dispossess locals and create segregated enclaves in a sea of inequality. This global dimension of succession often bypasses the gradual ecological process Burgess described – instead, it can transform neighborhoods rapidly and irreversibly.

Research comparing gentrification in New York, London, and Seoul, as discussed in a Washington University study, found that competitive global market forces have rapidly accelerated the pace and intensity of neighborhood transformation in these urban areas and in other global cities. The most recent phase of this process involves transnational capital directly reshaping local neighborhoods, with cascading displacement effects pushing original residents further to the urban periphery.

In the 1990s, new patterns of urban economics and politics were on the rise – globalization, neoliberalism, deregulation, and financialization – all linked to a more robust back-to-the-city movement, growing income inequality, and a greater prevalence of gentrification. In the 2000s, housing financialization and real estate speculation became major drivers of neighborhood change. These dynamics make it impossible to understand urban succession without reference to the broader global economic systems in which cities are embedded.

Limitations and continued relevance of the model 🔗

The invasion-succession model has been critiqued on several fronts. The concentric zone model has been criticized for assuming an even, unchanging landscape. Certain features – such as hills and water features – may make some locations unusually desirable or undesirable for residential purposes. It was also designed primarily for American industrial cities and has limited applicability to cities in other cultural and historical contexts.

Despite these limitations, the model suggests that urban spaces are never static; they are continuously being reshaped by social, economic, and political forces. Economic downturns may trigger waves of displacement, while upward mobility might lead to gentrification and the influx of higher-income residents. Each of these movements contributes to the ongoing cycle of invasion and succession, reinforcing the fluid and dynamic nature of urban spaces.

What has evolved is not so much the core insight – that neighborhoods change through group displacement – but our understanding of the forces behind it. Institutional racism, housing policy, global capital, and state-led urban redevelopment all play roles that a purely ecological model cannot capture. As ScienceDirect’s overview of urban sociology notes, understanding the role of institutions in affecting neighborhood change is vital to promoting fair housing and increasing housing opportunities across racial and ethnic lines.

What do you think? When a neighborhood changes dramatically over a decade – new cafes replace corner shops, property values double, and longtime residents relocate – is that a natural ecological process or the result of deliberate economic and political choices? And if global capital now shapes local neighborhoods as much as local demographics do, what tools do communities actually have to influence who gets to stay?

References

1. https://en.wikipedia.org/wiki/Urban_sociology
2. https://pmc.ncbi.nlm.nih.gov/articles/PMC3763509/
3. https://pmc.ncbi.nlm.nih.gov/articles/PMC4742432/
4. https://source.washu.edu/2025/12/a-tale-of-three-cities-book-explores-gentrification-in-global-context/
5. https://www.sciencedirect.com/topics/social-sciences/urban-sociology