It's my belief that most gaps that we see in performance, gender, income and other areas are simply the result of certain groups pursuing perceived opportunity more aggressively. Why are there more black people in the NBA (or many major sports)? Because there was the belief sports offered an opportunity out of a difficult situation, so a larger number of that group spent time practicing. I love basketball, but early on I saw I lacked the talent regardless of how much I practiced (10,000 hours seems to be the accepted societal myth these days). I also knew I had other skill sets in which I could excel if I focused on them.
Why are there so many Canadians and Russians who play hockey?
Why are most of my friends Jewish?
Why is one side of my family comprised overwhelmingly by educators, while the other is in some form of business management?
There is a knee-jerk response by the Left to always and everywhere explain gaps by relying on 'discrimination' of some kind. While this may be true, it's rarely the sole or even the primary reason for gaps. Gaps sometimes happen because certain groups pursue opportunities and benefits differently and/or more effectively. But there are many reasons for gaps, and discrimination isn't even the most interesting one to study.