Just so no one is confused
state[ steyt ]
7. a politically unified people occupying a definite territory
champion[ cham-pee-uhn ]
noun
1. a person who has defeated all opponents in a competition or series of competitions, so as to hold first place: the heavyweight boxing champion.
So a high school state champion must be first place out of the people in high schools in the defined territory (Indiana)
By logic of classed wrestling you could win an Indiana State title and call yourself a classed National champion because in the Indiana class you are the best in the country