This is the key phrase in what you posted. Some jurisdictions run Arabians, and maybe other breeds, I don't know, in separate races for that/those breed(s). But thoroughbreds only race with other thoroughbreds at any racetrack that ever runs a race in front of more than 200 people.
ML/NJ
“This is the key phrase in what you posted. Some jurisdictions run Arabians, and maybe other breeds, I don’t know, in separate races for that/those breed(s). But thoroughbreds only race with other thoroughbreds at any racetrack that ever runs a race in front of more than 200 people.”
Delaware accepts Jockey Club racing permits. Other states accept Jockey Club approved foreign registries.