Answer:
The novel To Kill a Mockingbird, written by Harper Lee in 1960, is an American literary classic, and recounts the life of a girl in the context of the Deep South of the early-1930s, when racial segregation towards African Americans was on the rise.
Thus, the three most important themes that this novel develops are:
- Racism and racial segregation, as the novel takes place in Alabama, which was one of the epicenters of segregation in the context of the Jim Crow Laws sanctioned after Reconstruction.
-Injustice, as Tom Robinson is accused and blamed for a crime he did not commit, for the simple reason of being a person with black skin.
-Ethics, as the girl's father, Atticus Finch, is a lawyer who defends African Americans in a totally hostile context towards them and their work, putting their reputation and even their safety at risk.