How does the arrival of a new minority group affect the social acceptance and outcomes of existing minorities? We study this question in the context of the First Great Migration. Between 1915 and 1930, 1.5 million African Americans moved from the U.S. South to Northern urban centers, which were...

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 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...