Here's a list with studies that support the idea that diversity in itself is a negative, and not only racial diversity:
heartiste.wordpress.com/diversity-proximity-war-the-reference-list/
diversity + proximity = war is the formula that captures the idea in general.
I'll list some its points:
– Social trust is negatively affected by ethnic diversity, case study in Denmark from 1979 to the present. Link.
– Ethnic homogeneity and Protestant traditions positively impact individual and societal levels of social trust. Link.
– “In longitudinal perspective, [across European regions], an increase in immigration is related to a decrease in social trust.” Link.
– Immigration undermines the moral imperative of those who most favor welfare benefits for the neediest. Link.
– The negative effect of community diversity on social cohesion is likely causal. Link.
– In Switzerland, social peace between diverse factions isn’t maintained by integrated coexistence, but rather by strong topographic and political borders that separate groups and allow them autonomy. Link.
– “Our analysis supports the hypothesis that violence between groups can be inhibited by both physical and political boundaries.” Link.
– Diversity hinders between-group cooperation at both the one-on-one and group levels. Link.
– The best chance for peace in Syria is better borders (intrastate or through the creation of new states) “suited to current geocultural regions”, and tribal autonomy. Link.
– Using data from US states, study finds a negative relationship between ethnic polarization and trust. Link.
– Diversity is associated with more White support for nationalist parties, except at the local level where large immigrant populations cut into vote totals for nationalist parties. Link.
– In Australia, ethnic diversity lowers social cohesion and increases “hunkering”, providing support for Putnam’s thesis finding the same results in the US. Link.
– After controlling for a self-selection bias, study finds that ethnic diversity in English schools reduces trust in same-age people and does not make White British students more inclusive in their attitudes towards immigrants. Link.
– In Germany, residential diversity reduces natives’ trust in neighbors, while it also reduces immigrants’ trust but through a different pathway. Link.
– Increasing social pluralism (diversity) is correlated with increased chance of collective violence. Link.
– “[E]thnic heterogeneity [diversity] explains 55% of the variation in the scale of ethnic conflicts, and the results of regression analysis disclose that the same relationship more or less applies to all 187 countries. … [E]thnic nepotism is the common cross-cultural background factor which supports the persistence of ethnic conflicts in the world as long as there are ethnically divided societies.” Link.
– Genetic Similarity Theory (GST) could help explain why diverse groups in close proximity increases ethnic conflict and ethnic nepotism. Link.
– Genetic diversity has contributed significantly to frequency of ethnic civil conflict, intensity of social unrest, growth of unshared policy preferences, and economic inequality over the last half-century. Link.
– Using social science data and computer modeling, researchers found that policies that attempt to create neighborhoods that are both integrated and socially cohesive are “a lost cause”. Link.
– The numbers and the genetic distance matter. Minority groups that get above a certain critical mass, and that are culturally distant from the majority culture, begin to self-segregate from the majority, moving society toward division and away from cooperation. Link.
