Final answer:
Harper Lee's upbringing in the racially segregated American South strongly influenced her writing of 'To Kill a Mockingbird' through the themes of race and injustice, the character of Atticus Finch, and the development of Scout as a protagonist.
Step-by-step explanation:
Harper Lee's upbringing in the racially segregated American South influenced her writing of 'To Kill a Mockingbird' in several ways. Firstly, her experiences in a racially divided society provided her with a unique perspective on race and injustice, which is a central theme in the novel. Secondly, Lee's father, who was a lawyer, inspired the character of Atticus Finch, a morally upright and principled figure who fights for justice. Lastly, Lee drew from her own childhood experiences to create the character of Scout, who serves as the narrator and protagonist of the story.