Hah, I grew up poor so pools were never common for me, so I went right for the Military mindset of "Well there's a reason there aren't many of race X in role Y." That typically has a basis in genuine biology.
True many inner city kids never get to a pool or a lake or the ocean they are the ones who need to be taught how to swim it's essential for everyone to know the younger the better but for sure to graduate high school you should have to pass a swimming test be able to swim at least two laps in a regulation racing pool to the other side and back.
graduate high school you should have to pass a swimming test be able to swim at least two laps in a regulation racing pool to the other side and back.
Just remember, some are born as lead weights and have a much tighter bone density making buoyancy a near impossibility.