Diversity Erodes Social Capital By Paul Walker

     Over the years a few brave academics have published research challenging the myth that diversity is an intrinsic strength. It should not be surprising since many homogeneous countries such as Japan do well, and most ethnically diverse countries ultimately face conflict, despite propaganda aimed to hold them together.
  http://www.amerika.org/politics/research-confirms-that-diversity-destroys-social-trust/
  https://www.researchgate.net/publication/335924797_Ethnic_Diversity_and_Social_Trust_A_Narrative_and_Meta-Analytical_Review

“Does ethnic diversity erode social trust? Continued immigration and corresponding growing ethnic diversity have prompted this essential question for modern societies, but few clear answers have been reached in the sprawling literature. Taking this as point of departure, this article reviews the existing literature on the relationship between ethnic diversity and social trust through a narrative review and a meta-analysis of 1,001 estimates from 87 studies. The review clarifies the core concepts, highlights pertinent debates, and tests core claims from the literature on the relationship between ethnic diversity and social trust. Several results stand out from the meta-analysis. We find a statistically significant negative relationship between ethnic diversity and social trust across all studies. The relationship is stronger for trust in neighbors, and when studied in more local contexts. Covariate conditioning generally changes the relationship only slightly. The review concludes by discussing avenues for future research.”

     Even though the myth of diversity has been known since ancient times, it serves money interests well, for a short time, before the societies in question split opewn, and the moneyed Dark Lords rush  off to do their deeds in the next place. Until there are no more places.
  http://www.amerika.org/science/science-confirms-it-diversity-destroys-civilization/
  http://www.amerika.org/politics/understanding-the-hart-celler-immigration-and-nationality-act-of-1965/