Do we have another Western democracy with 13% of its population descended from African slaves? Do we have another where almost as many are descended from a background of mostly American Indians?
Pound for pound, and ethnicity to ethnicity, Americans of whatever derivation are, in general healthier, live longer, and have many more firearms than the ol'boys back in the Old World wherever that might be!
The fact that they are descended from African slaves is only tangentially relevant.
What IS relevant is that many of them self-segregate into violent, lawless urban concrete jungles where there are minimal adverse consequences to blowing-away anyone who displeases them.