What is the setting of the book "The Miracle Worker"?

The Miracle Worker is set in the late 1880s, after the Civil War, just after the Reconstruction, a period in the South that was full of chaos and turmoil and change. Southerners like Captain Keller would harbor deep resentments towards the North.

The setting is significant to the story, because Captain Keller does not accept Anne Sullivan as Helen's teacher because she is from the North.  It was a very sensitive issue for men of the South, like the Captain, to accept the presence of a Yankee in his house.  

"From the beginning, Captain Keller establishes himself as a man of the South while he is discussing the Battle of Vicksburg with his son James during Annie's first breakfast with the Keller's." 

The physical setting is the Keller home in Alabama.