A study done in Brooklyn in the 1970s found that an 18 yo black male in Brooklyn had a 5% chance of dying a violent death by age 45. If anything those statistics have probably worsened and now include a significant percentage of women. If you factor in drug, alcohol use, overdoses and HIV, the mortality rate is even higher. Suspect that without immigration, the black population in the US, given violence, social pathology and abortion would be declining.
Thanks to blacks' penchant for recreational homicide, murder is now the leading cause of death for Americans under 25.
The statistics are so skewed that if you took blacks out of the picture, it would be the fourth leading cause of death, following accidents, illness, and suicide and our murder rate would be lower than most European countries.