ABSTRACT
Gordon Allport produced fundamental theoretical insights that intergroup contacts would reduce prejudices on the side of the majority against minorities. This chapter provides a systematic overview of a number of recent studies addressing the relationship between ethnic diversity and behavioral indicators of in-group solidarity. In terms of insights derived from contact theory, the propositions imply that ethnic diversity would be detrimental rather than beneficial, not only to intergroup relations but also to in-group relations, and that segregating people from various social and ethnic backgrounds would be most beneficial for maintaining social capital. Classic insights from contact theory predominantly focus on the relationship between intergroup contact and intergroup attitudes, like prejudice or more general exclusionary reactions towards out-groups. Putnam introduces 'constrict theory', which proposes a general negative impact of ethnic diversity on in-group solidarity and out-group derogation. The chapter examines the findings and priority given to the improvement of social cohesion.
