How do social group boundaries evolve? Does the appearance of a new out-group change the in-group's perceptions of other out-groups? We introduce a conceptual framework of context-dependent categorization, in which exposure to one minority leads to recategorization of other minorities when the...

Between 1940 and 1970 more than 4 million African Americans moved from the South to the North of the United States, during the Second Great Migration. This same period witnessed the struggle and eventual success of the civil rights movement in ending institutionalized racial discrimination. This...

How do social group boundaries evolve? Does the appearance of a new outgroup change the ingroup's perceptions of other outgroups? We introduce a conceptual framework of context-dependent categorization, in which exposure to one minority leads to recategorization of other minorities as in- or...

How does economic modernization affect group identity? Modernization theory emphasizes how labor migration led to the adoption of common identities. Yet economic development may reduce incentives to emigrate, preserving local cultures. We study England and Wales during the Second Industrial...