Diversity is our greatest strength

Ethnic Diversity has a negative impact on Firms and Workplace Cohesion
https://www.researchgate.net/publication/234022034_Demography_and_Diversity_in_Organizations_A_Review_of_40_Years_of_Research
https://archive.is/ZQORk
http://ftp.iza.org/dp6973_final.pdf

Ethnic Diversity is a cause of Civil War
onlinelibrary.wiley.com/doi/10.1111/jeea.12171/full

Neighborhood and Life Satisfaction is higher among Individuals living with co-ethnics (UK)
http://www.sciencedirect.com/science/article/pii/S0049089X16302095

Racial Tension has detrimental effects on economic growth
http://www.sciencedirect.com/science/article/pii/S0165176517300605

Ethnic Heterogeneity negatively affects political participation
http://www.sciencedirect.com/science/article/pii/S0261379415300494

Ethnic Diversity lowers innovation
http://onlinelibrary.wiley.com/doi/10.1002/job.2027/full

Ethnic Diversity has a strong direct negative impact on economic growth
https://www.sciencedirect.com/science/article/pii/S0305750X14000138

Diversity decreases charitable giving within communities
https://www.sciencedirect.com/science/article/pii/S0167268116300890

Ethnic Diversity decreases voter turnout
https://www.sciencedirect.com/science/article/pii/S0261379417300914

Ethnic Diversity Increases Poverty
https://www.sciencedirect.com/science/article/pii/S0305750X17300694

Immigration increases the Gender pay gap
https://www.sciencedirect.com/science/article/pii/S0014292116302264

Immigration accounts for 15% of Wealth inequality in the United States
https://www.sciencedirect.com/science/article/pii/S0378437116303429

https://www.brown.edu/academics/economics/sites/brown.edu.academics.economics/files/uploads/2013-15_paper_0.pdf

"These findings arguably reflect the contribution of genetic diversity to
the degree of fractionalization and polarization across ethnic, linguistic, and religious groups in
the  national  population;  the  adverse  influence  of  genetic  diversity  on  interpersonal  trust  and
cooperation; the contribution of genetic diversity to divergence in preferences for public goods
and redistributive policies; and the potential impact of genetic diversity on economic inequality
within a society."

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0095660

“Our analysis shows that peace does not depend on integrated coexistence, but rather on well defined topographical and political boundaries separating groups, allowing for partial autonomy within a single country. “

http://bjp.rcpsych.org/content/201/4/282.abstract?etoc

“For every ten percentage point reduction in own-group density, the relative odds of reporting psychotic experiences increased 1.07 times (95% CI 1.01–1.14, P = 0.03 (trend)) for the total minority ethnic sample. In general, people living in areas of lower own-group density experienced greater social adversity that was in turn associated with reporting psychotic experiences.”

“His conclusion based on over 40 cases and 30,000 people within the United States is that, other things being equal, more diversity in a community is associated with less trust both between and within ethnic groups.”

https://en.wikipedia.org/wiki/Robert_D._Putnam#Diversity_and_trust_within_communities

“We show that ethnic diversity or fractionalization and values diversity are distinct and while the former has a negative effect on innovation, the latter contributes positively. However, countries are bound to have both types of diversity. We find that countries that are ethnically homogenous but diverse in values orientation are the best innovators.”

http://www.tandfonline.com/doi/abs/10.1080/13504851.2015.1130785

Alienation, increased violence, isolation, destruction of community and loss of intermediate institutions, reduced civic participation and isolation from the aggregate social structure, psychosis, reduction of innovation. Humans are fundamentally a communal, not an individualist species and diversity destroys connection and solidarity. It's a communal pollutant.

https://www0.gsb.columbia.edu/faculty/jhjort/papers/ethnic%20divisions.pdf

My findings suggest that interethnic rivalries lower allocative efficiency in the private sector, that the economic costs of ethnic diversity vary with the political environment, and that in high-cost environments firms are forced to adopt ‘‘second best’’ policies to limit discrimination distortions.