The United States has failed to eliminate racial discrimination in the decades since ratifying the international human rights treaty that prohibits it. To its credit, the Biden Administration has attempted to center the fight for racial equity in the work of the executive branch. But President...

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...