In this article, we examine a large, interdisciplinary, and somewhat scattered literature, all of which falls under the umbrella term race mixture. We highlight important analytical distinctions that need to be taken into account when addressing the related, but separate, social phenomena of intermarriage, miscegenation, multiracial identity, multiracial social movements, and race-mixture ideologies. In doing so, we stress a social constructivist approach to race mixture with a focus on boundary crossing. Finally, we also demonstrate how ideologies and practices of race mixture play out quite differently in contexts outside of the United States, particularly in Latin America. Race-mixture ideologies and practices in Latin America have been used to maintain racial inequality in the region, thus challenging recent arguments by U.S. scholars that greater racial mixture leads to a decline in racism, discrimination, and inequality.