Final answer:
The description of the town's industrialization and pollution in Roll of Thunder, Hear My Cry best describes the novel's historical setting.
Step-by-step explanation:
The detail from Roll of Thunder, Hear My Cry that best describes the novel's historical setting is the description of the town and its industrialization: 'The air is thick, clammy with the breath of crowded human beings.' The town is obscured by smoke from iron-foundries, which rolls sullenly from the great chimneys and settles down in black, slimy pools on the muddy streets. This detail highlights the historical context of the novel, reflecting the industrialization and pollution of the time.