In my country, sport isn’t linked to the education system. A normal route is you start playing soccer as a young kid at your local club and you still play at that same club when you‘re 35 (or at some other club by then).
But in the US, sports is tied to schools and colleges as I understand it, not to clubs. Does that mean most americans suddenly stop playing organized soccer, basketball, hockey, tennis etc after they graduate college? How does it work after that?