Not one "That is Racist!!!" person here has tried to explain why they think all kinds of physical characteristics have evolved differently in different races, but they think the brain has evolved equally.
Are they trying to demonstrate by example that white people can be really stupid?
What does equal mean for human brain evolution? We evolved to survive to create the next generation. Our environments determine, to a large extent, what we need to survive.
I think intelligence is measured very narrowly among scientific racists.
Evolving equally for a brain would be to evolve to an equal level of intelligence.
"Our environments determine, to a large extent, what we need to survive."
In savage societies like those prevalent in Africa and pre-colonial North America, intelligence was not rewarded so it did not evolve. What was rewarded, in these violently savage societies, was aggression and brutality.
When advanced civilizations were enjoying the benefits of the scientists, philosophers, inventors, and other intelligent people, the savage societies like those prevalent in Africa and pre-colonial North America were enjoying the benefits of following the biggest, baddest, most psychotic chief around who could lead them into battle.
The smart white guys got the babes, so the smart genes were passed on.
The brutal, dumb, savage black guys got the babes, so the brutal, dumb, savage genes were passed on.
Science.
When those societies collided and war resulted, it was the advanced white society that would eventually win due to superior technology, strategy, and tactics. Due to superior intelligence.