In the 1920s, a scholar concluded that black death rates from homicide nationwide were about seven times white rates. In the 1930s, Southern observers also noticed startling rates of black violence, and in the 1940s, a Philadelphia study found that black men died from homicide at twelve times the white rate. When the U.S. government began publishing data specific to blacks in 1950, it revealed that same gap nationwide. The black homicide death rate remained as much as ten times higher than the white rate in 1960 and 1970, and has been five to seven times higher for most of the past thirty
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