Correct answers are the words "American" and "racism." Therefore, the full text would be:
"To Kill a Mockingbird" by Harper Lee is considered one of the most important American novels ever written. It addresses a serious social problem and conveys an uplifting message. It may have encouraged people to empathize with those who suffer due to racism.
We can arrive at this answer because:
For this reason, we can say that the book helped readers to have greater empathy for people who suffer from racism.
More information about racism at the link:
https://brainly.com/question/2864094