Final answer:
Joel Chandler Harris and Margaret Mitchell are both known for their contributions to American literature with a focus on the American South.
Step-by-step explanation:
Joel Chandler Harris and Margaret Mitchell have the commonality of being known for their contributions to American literature with a focus on the American South. Both authors have made significant contributions to Southern literature and have portrayed the culture and history of the American South in their works. Harris is known for his Uncle Remus stories, which capture the folklore and oral traditions of the South, while Mitchell is famous for her novel Gone with the Wind, which provides a vivid depiction of the South during the Civil War.