Over the same time period, the US population has been increasing in diversity. Among other negative aspects, increased diversity increases social alienation. It reduces social cohesion and trust not just between groups but within them.<p>[.] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Robert_D._Putnam#Diversity_and_trust_within_communities" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Robert_D._Putnam#Diversity_and...</a><p>[#] <a href="http:&#x2F;&#x2F;politicalscience.ku.dk&#x2F;staff&#x2F;Academic_staff&#x2F;?pure=files%2F130251172%2FDinesen_S_nderskov_Ethnic_Diversity_and_Social_Trust_Forthcoming_ASR.pdf" rel="nofollow">http:&#x2F;&#x2F;politicalscience.ku.dk&#x2F;staff&#x2F;Academic_staff&#x2F;?pure=fil...</a>