That's a fair question. According to FBI homicide statistics for 2018 [1] and US demographics [2], the Black homicide rate per 100k is 7.9, while the White+Hispanic rate [3] is 1.2. The female (of all races) homicide rate is 0.42.
So the Black homicide rate is 6.7x higher than the White+Hispanic rate, while the White+Hispanic homicide rate is 2.8x higher than the female (all races) rate.
Edit: A different source [4] gives different figures, but these are "age adjusted": 20.9 for non-Hispanic Blacks, and 2.6 for non-Hispanic Whites.
[3] The FBI counts Hispanics as White, and has a separate 'Ethnicity' category where they mark Hispanic or Latino. Assuming all Hispanics in that table were counted as White yields an even lower White homicide rate.
So the Black homicide rate is 6.7x higher than the White+Hispanic rate, while the White+Hispanic homicide rate is 2.8x higher than the female (all races) rate.
Edit: A different source [4] gives different figures, but these are "age adjusted": 20.9 for non-Hispanic Blacks, and 2.6 for non-Hispanic Whites.
[1] https://ucr.fbi.gov/crime-in-the-u.s/2018/crime-in-the-u.s.-... - and using homicide instead of something as nebulous as "violence" because it is the statistic most difficult to distort, and is immune to over-policing.
[2] https://en.wikipedia.org/wiki/Demographics_of_the_United_Sta...
[3] The FBI counts Hispanics as White, and has a separate 'Ethnicity' category where they mark Hispanic or Latino. Assuming all Hispanics in that table were counted as White yields an even lower White homicide rate.
[4] https://www.cdc.gov/mmwr/volumes/66/wr/mm6631a9.htm