All Ohio State players were from Ohio, all Michigan players were from Michigan, all Illinois players were from Illinois, all Texas players were from Texas etc. A good high school player in, say, Ohio automatically went to Ohio State and would never play in Michigan or Pennsylvania, etc.
Similarly, all Chicago Cubs players were from Chicago, all Pittsburgh Pirates players were from Pittsburgh etc.
A childhood belief about sport

others believed things like this
- I used to think that a conductor while conducting told the players what to play as opposed to their music.— Daryl
- When I was little, I used to believe that football players really had shoulders that big.— Angie
- I used to believe that records were the power source for record players.— bob
- I thought for some reason that chewing tobacco was REQUIRED for Major League Baseball players.— Jeff
- My dad told me that playing basketball makes you taller. Basketball players are tall, so I believed him.Anon
- I used to think the entire state of Pennsylvania was made out of pencils.— Pencil-vania