Why are the calendars of the white and black schools different in the book roll of thunder hear my cry?

In "Roll of Thunder, Hear My Cry," the calendars of white and black schools are different to reflect the racial segregation and inequality prevalent at that time. The white schools had longer schedules with more resources, while the black schools had shorter calendars and fewer resources. This segregation was a way to perpetuate unequal opportunities and reinforce racial hierarchies.