Black people are severally underrepresented among swimmers in general, not just among competitive swimmers. The BBC had an interesting article about this a few years ago [1].

This is a serious problem, leading to unnecessary deaths of black children. Here's an article by the founder of an organization trying to address this called "Black Kids Swim" [2].

[1] http://www.bbc.com/news/world-us-canada-11172054

[2] https://www.washingtonpost.com/opinions/this-stereotype-is-k...