People have no problem admitting certain races have better physical genetics.  It is no coincidence that every 100m sprinter in the olympics are black.  If genetics make up our physical attributes the same applies to intelligence.  It is clear that blacks have a lower average iq. 

Black people had a less harsh environment to evolve in so their brains didn't have to adapt like northern europeans.  while africans were still living in huts europeans were smelting metal, glass making, building huge structures, etc.

Also I will leave this here:  https://www.usatoday.com/story/tech/2015/07/01/google-apologizes-after-photos-identify-black-people-as-gorillas/29567465/

black people were being recognized as apes by their Image identification program