My town is big into high school football - it is the most popular of all the interscholastic sports.  
Yeah, it is popular here too. Does high school football differ from college football in any way?
I'm not 100% on that, but I do know they seemed to both start at the same time, in the late 19th century.
When did football start to become the most popular sport?
Well, in the late 19th and 20th centuries many of the colleges actually played the high school teams, so I'm guessing it started around that time.
Interesting. How many players play on a team?
talented enough.
In the 2000s and beyond, there has been growing concern about safety and long-term brain health, both regarding the occasional concussion as well as the steady diet of lesser hits to the head.
Rules.
The National Federation of State High School Associations (NFHS) establishes the rules of high school football in the United States.
As of the next high school season of 2019, Texas is the only state that does not base its football rules on the NFHS rule set, instead using
High school football
High school football is gridiron football played by high school teams in the United States and Canada. It ranks among the most popular interscholastic sports in both countries.
High school football began in the late 19th century, concurrent with the start of many college football programs. In the late 19th and early 20th centuries, many college and high school teams played against one another. Today, the oldest high school football rivalry dates back to 1875 in Connecticut, between the Norwich Free Academy Wildcats and the New London