More diverse neighborhoods have lower social cohesion. Source: http://www.citylab.com/housing/2013/11/paradox-diverse-communities/7614/

Diversity increases psychotic experiences. Source: http://bjp.rcpsych.org/content/201/4/282.full

Diversity increases social adversity. Source: http://bjp.rcpsych.org/content/201/4/282.full

A 10% increase in diversity doubles the chance of psychotic episodes. Source: http://bjp.rcpsych.org/content/201/4/282.full

Diversity reduces voter registration, political efficacy, charity, and number of friendships. Source: http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9477.2007.00176.x/abstract

Ethnic diversity reduces happiness and quality of life. Source: http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9477.2007.00176.x/abstract

Diversity reduces trust, civic participation, and civic health. Source: http://www.boston.com/news/globe/ideas/articles/2007/08/05/the_downside_of_diversity/?page=full

Ethnic diversity harms health for Hispanics and Blacks. Source: http://ajph.aphapublications.org/doi/abs/10.2105/AJPH.2012.300787

Diversity primarily hurts the dominant ethnic group. Source: http://www.theindependentaustralian.com.au/node/57

Ethnic diversity reduces concern for the environment. Source: http://link.springer.com/article/10.1007%2Fs10640-012-9619-6

Ethnic diversity within 80 meters of a person reduces social trust. Source: http://curis.ku.dk/ws/files/130251172/Dinesen_S_nderskov_Ethnic_Diversity_and_Social_Trust_Forthcoming_ASR.pdf#page=2

Ethnic diversity directly reduces strong communities. Source: https://www.msu.edu/~zpneal/publications/neal-diversitysoc.pdf

Ethnically homogeneous neighborhoods are beneficial for health. Source: https://www.mailman.columbia.edu/public-health-now/news/living-ethnically-homogenous-area-boosts-health-minority-seniors

In America, more diverse cities have more segregation. Source: http://fivethirtyeight.com/features/the-most-diverse-cities-are-often-the-most-segregated/

Homogeneous polities have less crime, less civil war, and more altruism. Source: http://link.springer.com/article/10.1007%2Fs10464-013-9608-0

States with little diversity have more democracy, less corruption, and less inequality. Source: http://www.theindependentaustralian.com.au/node/57

There is extensive evidence people prefer others who are genetically similar. Source: http://psychology.uwo.ca/faculty/rushtonpdfs/n&n%202005-1.pdf

Borders, not multiculturalism, reduce intergroup violence. Source: http://arxiv.org/abs/1110.1409

Diversity reduces charity and volunteering. Source: http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9477.2007.00176.x/abstract

People who live in diverse communities rather than homogenous ones are poorer and less educated. Source: http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9477.2007.00176.x/abstract

Black people trust their neighbors less than do White people. Source: http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9477.2007.00176.x/abstract

Spanish speakers trust their neighbors less than do English speakers. Source: http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9477.2007.00176.x/abstract

Asians trust their neighbors less than do White people. Source: http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9477.2007.00176.x/abstract

Ethnically diverse workplaces have lower cohesion, lower satisfaction and higher turnover. Source: http://jom.sagepub.com/content/23/3/239.short?rss=1&ssource=mfc

Ethnic diversity reduces social trust. Source: http://www.nber.org/papers/w5677

Ethnic diversity among members of the same race reduces infrastructure quality, charity, and loan repayment. Source: http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9477.2007.00176.x/abstract

Diversity of any sort makes people more likely to defect in game theoretic scenarios. Source: http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9477.2007.00176.x/abstract

Homogeneous military units have less desertion than diverse units. Source: http://www.nber.org/papers/w8627

Diversity correlates with low GDP. Source: https://www.washingtonpost.com/news/worldviews/wp/2013/05/16/a-revealing-map-of-the-worlds-most-and-least-ethnically-diverse-countries/

Ethnic homogeneity correlates with strong democracy. Source: https://www.washingtonpost.com/news/worldviews/wp/2013/05/16/a-revealing-map-of-the-worlds-most-and-least-ethnically-diverse-countries/

Genetic diversity causes societal conflict. Source: https://www.nber.org/papers/w21079

Ethnic diversity causally decreases social cohesion. Source: http://esr.oxfordjournals.org/content/early/2015/08/20/esr.jcv081.full