I grew in a town with lots of parks. Yes the smallest and shitest used to be black only. Basically just look for park in lower area. And we started building suburbs with redlines on day one the raciam didn’t need to wait for redlines to go away. The school district thing. That’s a bit more region based. Up North they mosrohad mono ethnic neighborhoods so they was less need to make seperate racial schools. The south although they had redlines and other housings policy creating black and white neighborhoods they also just went fully into making blackand white only schools.