By race? Certainly.
You did not specify by race making me raise this question. Do you really think people are equally born with the same brain capacities?
Really?
So, go ahead and provide the studies.
1) I never said that babies are born a Blank State. In fact, most social scientists do not agree with the Blank State. The majority agree that babies are born with distinct temperament styles, which is highly ingrained. Temperament is the building blocks of personality. So, yes, temperament is biological, and most social scientists agree with this. See the work of Thomas and Chess and other Temperament theorists.
2) My hypothesis, which has overwhelming evidence, is that cultural affects brain functioning and structure. It's true, even if you do not want to accept this fact. How that interacts with naturally occurring abilities, well, Id have to do the research.
3) Related to point 2, we would also need to know how intra-uterine exposure to a variety of circumstances, which affects the mother, also affect the babies development inside the womb. There is overwhelming evidence that parental factors affects the brain development of the baby in the womb. So, if certain babies are born with a different set of capacities, how are environmental factors affecting the development of the baby in the womb? I am one who rarely ever puts 100% stock in genetics or environment.