How did public schools in the south become segregated?

Wiki sais "States and school districts did little to reduce segregation, and schools ... The study found that minority students became more isolated and less"

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.