Chapter 20 of "To Kill a Mockingbird" is a significant chapter in the novel, as it marks the beginning of the trial of Tom Robinson, a black man accused of raping a white woman, Mayella Ewell. The chapter begins with Atticus Finch, the defense lawyer, questioning Mayella on the stand.
Mayella's testimony is riddled with contradictions and inconsistencies, which Atticus points out in his cross-examination. He also highlights the fact that Mayella's injuries, which she claims were caused by Tom during the alleged rape, were actually inflicted by her own father, Bob Ewell. Atticus believes that Bob Ewell, who is a known alcoholic and abusive towards his children, is the real culprit in the case and that Mayella is covering for him.
Despite Atticus's eloquent defense, the jury ultimately decides to convict Tom Robinson. This decision is deeply disappointing to Atticus, who knows that Tom is innocent and that the justice system has failed him. The chapter ends with Atticus leaving the courthouse, feeling defeated and disillusioned.
Overall, chapter 20 of "To Kill a Mockingbird" serves to highlight the deeply ingrained racism and injustice present in the society of Maycomb. It also serves as a poignant reminder of the importance of fighting for what is right, even in the face of overwhelming odds. Atticus's commitment to justice, even in the face of certain defeat, is a testament to his character and serves as an inspiration to readers.