When everyone is dirty, they/we win.

If Jamaica/US were all clean and the rest of world were dirty, it would be much closer.

If the rest of the world is clean and Jamaica/US are dirty, then it is a blowout for Jamaica/US (Jamaica/US have most of the top times in history). They/we have the talent and the money/training to win.

On average, Samoan's are a big people compared to the rest of the world's population. On average, people from West African decent are fast compared to the rest of the world's population. The majority of the fastest times in history are from them. Much of Jamaica has West African ancestry.

I believe of the all-time fastest 100 meter times in history, the first white guy's time comes in at #225, by Christophe Lemaitre in 2011 from France, and its not due to a lack of opportunity or training or motivation for white sprinters. I don't think there is a poly in the top 2,000 100 meter times that I briefly scanned on the internet a while ago (I know we are all made up of more than one heredity).

People like Usain Bolt and Elaine Thompson-Herah are freaks of nature in the best of ways for what they do compared to the rest of everyone. Great biomechanics, etc.

I don't hear many say, man we need more Vietnamese O-Linemen on our football team. And that's ok. Some areas have evolved to being on average taller/shorter than others, some larger/smaller than others, some faster/slower than others. It just is what it is.

It doesn't make anyone intrinsically greater/lesser than another.