Sociology & Political Science
Social Cohesion in Diverse Societies: Does Diversity Divide or Can It Unite?
Robert Putnam's controversial finding that diversity reduces social trust has dominated the debate for two decades. Newer research from Singapore, Brazil, and Indonesia reveals a more nuanced picture: diversity's effects on cohesion depend on the institutional and cultural infrastructure that mediates contact between communities.
By Sean K.S. Shin
This blog summarizes research trends based on published paper abstracts. Specific numbers or findings may contain inaccuracies. For scholarly rigor, always consult the original papers cited in each post.
Robert Putnam's 2007 finding that ethnic diversity reduces social trust and civic engagement—what he called the "hunkering down" effect—has cast a long shadow over the diversity-cohesion debate. If diversity erodes the social bonds that hold communities together, then immigration, multiculturalism, and globalization carry social costs that their advocates have underacknowledged.
Two decades later, the evidence base has expanded beyond North American and Western European surveys to include comparative research from Asia, Latin America, and Africa. This broader perspective reveals that Putnam's finding, while not wrong, was incomplete. Diversity does not have a single, universal effect on social cohesion. Its impact depends on the institutional infrastructure—housing policies, educational systems, civic organizations, cultural practices—that either facilitates or impedes meaningful contact between communities.
Neighborhood-Level Dynamics
Hartl and Mayer (2025) examine how population mobility—particularly immigration-related mobility—affects neighborhood cohesion. Social cohesion, encompassing trust, mutual support, and a sense of shared belonging, is foundational to democratic societies. Yet how this cohesion is affected by increasing population mobility remains contested and often under-theorized.
The neighborhood focus is methodologically important because social cohesion is experienced locally—in the streets, shops, schools, and public spaces where people actually encounter their neighbors. National-level diversity statistics may obscure neighborhood-level dynamics: a country with high national diversity may contain neighborhoods that are internally homogeneous, and a country with moderate national diversity may contain neighborhoods where different communities share space intensely.
The paper examines how residential turnover—people moving in and out—affects the social networks, trust levels, and community engagement that constitute cohesion. High mobility disrupts the repeated interactions through which trust develops. But the disruption is not permanent: communities with strong institutional infrastructure (community organizations, shared public spaces, inclusive governance) rebuild cohesion faster than communities without it.
Singapore: Managed Diversity
Wang (2024) examines Singapore's approach to balancing economic growth and social cohesion through immigration policies. In the context of limited natural resources and an aging population, Singapore relies heavily on immigration to drive economic growth.
Singapore's approach to diversity and cohesion is distinctive: the state actively manages ethnic composition through housing policy (ethnic quotas in public housing blocks), education (bilingual policy requiring English plus a "mother tongue"), and national service (mandatory military service as a shared national experience). This managed diversity has produced relatively high levels of inter-ethnic trust and social cohesion—but at the cost of individual choice and the potential suppression of cultural expression that does not fit the state-approved framework.
Brazil: Cultural Festivals as Cohesion Infrastructure
Oliveirra (2024) investigates the role of cultural festivals in fostering social cohesion within Brazil's multicultural society. Cultural festivals serve as vital platforms for celebrating diversity and promoting social cohesion.
The Brazilian case illustrates how cultural practices can function as cohesion infrastructure. Carnival, June Festivals (Festas Juninas), and Afro-Brazilian celebrations create shared experiences across racial, class, and regional lines—temporary spaces where social hierarchy is suspended (or at least negotiated) through collective celebration. These festivals do not eliminate inequality, but they create moments of shared identity and mutual recognition that accumulate into social capital over time.
Indonesia: Education and Religious Cohesion
Fahmi, Nuruzzaman, and Hilmy (2025) explore the role of multicultural Islamic education in strengthening social cohesion in Indonesia's diverse society. Issues of social cohesion and interfaith tolerance are crucial in societies like Bali, Indonesia, and Southern Thailand, which have experienced conflicts related to religious and cultural differences.
The study examines how educational institutions can be designed to promote social cohesion across religious lines—a question with relevance far beyond Indonesia. The multicultural Islamic education model does not suppress religious identity but teaches students to understand, respect, and engage with other traditions while maintaining their own.
Claims and Evidence
<
| Claim | Evidence | Verdict |
|---|
| Diversity universally reduces social cohesion | Hartl & Mayer (2025): effects depend on institutional infrastructure; not universal | ❌ Refuted (as universal claim) |
| State-managed diversity produces social cohesion | Wang (2024): Singapore's approach produces cohesion but constrains individual choice | ⚠️ Uncertain (depends on values) |
| Cultural practices can build cohesion across difference | Oliveirra (2024): festivals create shared experiences and social capital | ✅ Supported |
| Education can promote interfaith social cohesion | Fahmi et al. (2025): multicultural Islamic education in Indonesia | ✅ Supported |
Implications
The evidence suggests that social cohesion in diverse societies is not automatic—but neither is social fragmentation. Both outcomes depend on the institutional infrastructure that mediates contact between communities. Societies that invest in shared spaces, inclusive civic organizations, multicultural education, and cultural exchange practices create the conditions for cohesion. Societies that leave diversity unmediated—relying on market forces and residential self-sorting—are more likely to experience the fragmentation that Putnam documented.
Robert Putnam's 2007 finding that ethnic diversity reduces social trust and civic engagement—what he called the "hunkering down" effect—has cast a long shadow over the diversity-cohesion debate. If diversity erodes the social bonds that hold communities together, then immigration, multiculturalism, and globalization carry social costs that their advocates have underacknowledged.
Two decades later, the evidence base has expanded beyond North American and Western European surveys to include comparative research from Asia, Latin America, and Africa. This broader perspective reveals that Putnam's finding, while not wrong, was incomplete. Diversity does not have a single, universal effect on social cohesion. Its impact depends on the institutional infrastructure—housing policies, educational systems, civic organizations, cultural practices—that either facilitates or impedes meaningful contact between communities.
Neighborhood-Level Dynamics
Hartl and Mayer (2025) examine how population mobility—particularly immigration-related mobility—affects neighborhood cohesion. Social cohesion, encompassing trust, mutual support, and a sense of shared belonging, is foundational to democratic societies. Yet how this cohesion is affected by increasing population mobility remains contested and often under-theorized.
The neighborhood focus is methodologically important because social cohesion is experienced locally—in the streets, shops, schools, and public spaces where people actually encounter their neighbors. National-level diversity statistics may obscure neighborhood-level dynamics: a country with high national diversity may contain neighborhoods that are internally homogeneous, and a country with moderate national diversity may contain neighborhoods where different communities share space intensely.
The paper examines how residential turnover—people moving in and out—affects the social networks, trust levels, and community engagement that constitute cohesion. High mobility disrupts the repeated interactions through which trust develops. But the disruption is not permanent: communities with strong institutional infrastructure (community organizations, shared public spaces, inclusive governance) rebuild cohesion faster than communities without it.
Singapore: Managed Diversity
Wang (2024) examines Singapore's approach to balancing economic growth and social cohesion through immigration policies. In the context of limited natural resources and an aging population, Singapore relies heavily on immigration to drive economic growth.
Singapore's approach to diversity and cohesion is distinctive: the state actively manages ethnic composition through housing policy (ethnic quotas in public housing blocks), education (bilingual policy requiring English plus a "mother tongue"), and national service (mandatory military service as a shared national experience). This managed diversity has produced relatively high levels of inter-ethnic trust and social cohesion—but at the cost of individual choice and the potential suppression of cultural expression that does not fit the state-approved framework.
Brazil: Cultural Festivals as Cohesion Infrastructure
Oliveirra (2024) investigates the role of cultural festivals in fostering social cohesion within Brazil's multicultural society. Cultural festivals serve as vital platforms for celebrating diversity and promoting social cohesion.
The Brazilian case illustrates how cultural practices can function as cohesion infrastructure. Carnival, June Festivals (Festas Juninas), and Afro-Brazilian celebrations create shared experiences across racial, class, and regional lines—temporary spaces where social hierarchy is suspended (or at least negotiated) through collective celebration. These festivals do not eliminate inequality, but they create moments of shared identity and mutual recognition that accumulate into social capital over time.
Indonesia: Education and Religious Cohesion
Fahmi, Nuruzzaman, and Hilmy (2025) explore the role of multicultural Islamic education in strengthening social cohesion in Indonesia's diverse society. Issues of social cohesion and interfaith tolerance are crucial in societies like Bali, Indonesia, and Southern Thailand, which have experienced conflicts related to religious and cultural differences.
The study examines how educational institutions can be designed to promote social cohesion across religious lines—a question with relevance far beyond Indonesia. The multicultural Islamic education model does not suppress religious identity but teaches students to understand, respect, and engage with other traditions while maintaining their own.
Claims and Evidence
<
| Claim | Evidence | Verdict |
|---|
| Diversity universally reduces social cohesion | Hartl & Mayer (2025): effects depend on institutional infrastructure; not universal | ❌ Refuted (as universal claim) |
| State-managed diversity produces social cohesion | Wang (2024): Singapore's approach produces cohesion but constrains individual choice | ⚠️ Uncertain (depends on values) |
| Cultural practices can build cohesion across difference | Oliveirra (2024): festivals create shared experiences and social capital | ✅ Supported |
| Education can promote interfaith social cohesion | Fahmi et al. (2025): multicultural Islamic education in Indonesia | ✅ Supported |
Implications
The evidence suggests that social cohesion in diverse societies is not automatic—but neither is social fragmentation. Both outcomes depend on the institutional infrastructure that mediates contact between communities. Societies that invest in shared spaces, inclusive civic organizations, multicultural education, and cultural exchange practices create the conditions for cohesion. Societies that leave diversity unmediated—relying on market forces and residential self-sorting—are more likely to experience the fragmentation that Putnam documented.
References (4)
[1] Hartl, J. & Mayer, I. (2025). Dynamics of (Dis)Integration: The Impact of Migration Mobility on Neighbourhood Cohesion. Urban Studies.
[2] Wang, Y. (2024). Balancing Economic Growth and Social Cohesion: Immigration Policies in Singapore.
[3] Oliveirra, S.L. (2024). The Role of Cultural Festivals in Fostering Social Cohesion in Multicultural Societies in Brazil. Cultural Journal, 2(1), 67.
[4] Fahmi, M., Nuruzzaman, M.A., & Hilmy, M. (2025). Multicultural Islamic Education as Strategy for Strengthening Social Cohesion in Islamic School. Nazhruna, 8(1), 67.