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State rates of Negro American homicide vary sharply across the nation. An ecological analysis of these differences reveals two principal correlates: homicidal culture (as measured by the white homicide rates of the native states of Negroes) and the percentage of non-white makes born out of state. Two orthogonal patterns of high Negro homicide rates emerge: one involves high homocidal culture with rapid social change and is centered in fringe southern states; the other involves medium homicidal culture with high non-white in-migration and is centered in the Midwest. These findings are consistent with a variety of historical, survey, and crime data on homicidal culture and migration.
Pettigrew et al. (Tue,) studied this question.