USC is good for the same reason why Peters Township & Pine Richland are now good, NA has been and continues to be good. It's the same reason why Avon in Ohio is good and why Catholic schools were good before they started recruiting. It is the reason why Fox Chaple usually isn't good.
Parents.
Parents who are approaching or already upper middle class, expects their kids to be disciplined and work hard. That is enough to win a lot of football games against more athletic teams at the HS level.
Parents who are too rich who let money raise their kids or too poor they are just trying to survive, don't instill the discipline required. The schools I mentioned have a lot of parents who demand discipline and hard work. All it takes with that main ingredient is just a few kids to be slightly above average athletes and a coach who won't beat himself.
Parents.
Parents who are approaching or already upper middle class, expects their kids to be disciplined and work hard. That is enough to win a lot of football games against more athletic teams at the HS level.
Parents who are too rich who let money raise their kids or too poor they are just trying to survive, don't instill the discipline required. The schools I mentioned have a lot of parents who demand discipline and hard work. All it takes with that main ingredient is just a few kids to be slightly above average athletes and a coach who won't beat himself.