[Paper Review] Barriers to Integration: Institutionalized Boundaries and the Spatial Structure of Residential Segregation

Elizabeth Roberto, Jackelyn Hwang|arXiv (Cornell University)|Sep 8, 2015

Urban, Neighborhood, and Segregation Studies40 references3 citations

TL;DR

This paper identifies physical barriers and municipal boundaries as key institutional forces that sustain residential segregation in 14 U.S. cities by creating spatial divisions that limit integration. Using 2010 census data and a novel spatial analysis method, it demonstrates that these boundaries significantly increase segregation levels, revealing a structural mechanism that maintains racial and socioeconomic separation.

ABSTRACT

Despite modest declines in residential segregation levels since the Civil Rights Era, segregation continues to be a defining feature of the US landscape. This paper argues that physical barriers in urban space and municipal boundaries that separate central cities from their surrounding suburbs are powerful forces that exacerbate residential segregation for urban residents and contribute to its persistence. We draw on population data and corresponding shapefiles from the 2010 decennial census and a novel approach to measuring and analyzing segregation that allows us to incorporate physical barriers and municipal boundaries. We show how these boundaries impose stark separations between spatial areas and contribute to higher levels of residential segregation across 14 US cities. The findings demonstrate an important mechanism that facilitates and maintains residential segregation.

Motivation & Objective

• To investigate how institutionalized boundaries—both physical and municipal—contribute to persistent residential segregation in U.S. urban areas.
• To analyze the spatial impact of these boundaries on segregation patterns across 14 major U.S. cities.
• To develop and apply a novel method for measuring segregation that incorporates physical and political boundaries as structural factors.
• To assess the extent to which these boundaries create and maintain spatial separation beyond individual-level residential choices.
• To demonstrate that institutionalized boundaries are a critical, underappreciated mechanism in the persistence of urban residential segregation.

Proposed method

• Utilizes 2010 decennial census data, including population and housing unit distributions across census tracts.
• Employs shapefiles to map and analyze the spatial configuration of municipal boundaries and physical barriers such as highways and rivers.
• Applies a novel segregation measurement framework that integrates boundary effects into spatial segregation indices.
• Uses spatial statistical modeling to isolate the contribution of institutional boundaries to overall segregation levels.
• Compares segregation levels with and without boundary-inclusive metrics to quantify their impact.
• Analyzes 14 U.S. metropolitan areas to identify consistent patterns across diverse urban contexts.

Experimental results

Research questions

• RQ1 To what extent do municipal boundaries and physical barriers contribute to higher levels of residential segregation in U.S. cities?
• RQ2 How do institutionalized boundaries shape the spatial structure of segregation beyond individual residential choices?
• RQ3 In what ways do these boundaries create and maintain spatial separation across urban and suburban areas?
• RQ4 How does the inclusion of physical and political boundaries in segregation metrics alter the measurement of residential segregation?
• RQ5 What is the relative contribution of institutional boundaries compared to other structural factors in sustaining segregation?

Key findings

• Municipal boundaries and physical barriers significantly increase measured levels of residential segregation across the 14 U.S. cities studied.
• The inclusion of institutional boundaries in segregation metrics reveals a substantial and consistent increase in segregation scores.
• Spatial separation created by these boundaries is a key structural mechanism that maintains racial and socioeconomic residential patterns.
• The study finds that institutionalized boundaries impose stark separations between urban and suburban areas, reinforcing existing segregation.
• The effect of these boundaries is robust across diverse metropolitan areas, indicating a widespread and systemic influence on urban spatial structure.
• The findings demonstrate that institutional boundaries are a critical, yet often overlooked, factor in the persistence of residential segregation.