Race is not just a difference of skin color.
Some other notable biological differences would be that we have different skull structures, we have different facial features, different races cannot give/receive bone marrow transplants, and many genetic differences, for example sickle cell anemia almost exclusively effects blacks.
Is it unreasonable to claim that perhaps their is an average difference in intelligence, entirely due to biological differences and not socioeconomic?
Blacks on average score lower on IQ tests than whites, even rich black people compared to poor white people, and even black children raised in wealthy white homes.
They lived in Africa uncontacted for hundreds of years and never advanced past stone age level technology, while at the same time whites and East Asians had amazing civilizations and technology.
In the US over 50% of murders are committed by blacks despite them only making up about 13% of the population. They commit crimes at vastly disproportionate rates compared to whites, and you can't blame it on them being poor because many regions in the Appalachias are also extremely poor, but also very white, and low crime.
Hundreds of white women are raped by black men every year, do you know the average number of black girls raped by white men? Literally zero.
Face it, some races are biologically just less intelligent and more prone to commit crime. Those "cultural/regional differences" stem from biological differences.