What physical divisions/ boundaries can be found in the town of Millwood in the novel, The Queen of Palmyra?

The town of Millwood itself is divided into two sections: the white neighborhood, which is known as Millwood "Proper" and Shake Rag is the black neighborhood where Zenie, Ray, and Eva live. Although the neighborhood is far poorer than the white neighborhood where Florence has grown up, everyone lives in a state of pride, keeping their gardens and lawns perfectly groomed.