I can dump my 1-post pasta really quick since OP is a fag
https://ose.utsc.utoronto.ca/ose/story.php?id=2135
>Previous research shows people are less likely to feel connected to people outside their own ethnic groups, and we wanted to know why,says Gutsell. What we found is that there is a basic difference in the way people's brains react to those from other ethnic backgrounds. Observing someone of a different race produced significantly less motor-cortex activity than observing a person of one's own race.

http://en.wikipedia.org/wiki/Frank_Salter#Diversity_research
>More ethnically homogeneous nations are better able to build public goods, are more democratic, less corrupt, have higher productivity and less inequality, are more trusting and care more for the disadvantaged, develop social and economic capital faster, have lower crime rates...

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0095660
>Our analysis shows that peace does not depend on integrated coexistence, but rather on well defined topographical and political boundaries separating groups

http://msutoday.msu.edu/news/2013/study-asks-is-a-better-world-possible/
>policymakers have attempted to create communities where a diverse group of residents not only live close to one other but also interact freely -in other words, neighborhoods that are both integrated and socially cohesive.
>The more integrated a neighborhood is, the less socially cohesive it becomes, and vice versa.

http://www.city-journal.org/html/eon2007-06-25jl.html
https://www.boston.com/news/globe/ideas/articles/2007/08/05/the_downside_of_diversity/
>Harvard political scientist Robert Putnam, author of Bowling Alone, is very nervous about releasing his new research, and understandably so.
>His five-year study shows that immigration and ethnic diversity have a devastating short- and medium-term influence on the social capital, fabric of associations, trust, and neighborliness that create and sustain communities.