I know of a rivalry down here in Miami called the Soul Bowl.
The Soul Bowl originally started between two historically black high schools. Booker T. Washington Senior high school (Overtown) and DA Dorsey Senior high school (Liberty City). I don't know what year the game started but it ended in 1955.
In 1955 Da Dorsey shut down to become an educational school and Miami Northwestern Senior high school was built. Miami Northwestern was built because of the overcrowding in the area. The game continued until 1967 when Booker T. Washington became a middle school to help desegregation in schools.
In 1967 Miami Jackson Senior high school and Miami Northwestern started their annual game and is still in existence. At the time Jackson was a majority black school and half of the Overtown neighborhood was zoned to Jackson. This game saw crowds of 15,000 yearly or more until 1998 when they saw their biggest attendance. In 1998 Both were in the same district which had Soul Bowl 1 with 46,000 and Soul Bowl 2 with 35,000. This game is still in existence but lost its luster due to the football team and marching band not doing well on Jackson side and the school is now majority Hispanic. This game now draws probably 4,000.
Present day the biggest rivalry in Miami is Miami Central and Miami Northwestern. They been playing I believe since the 80's but have an actual game called the Commissinor Cup since 2009.