You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
To_Kill_a_Mockingbird

Context:
Harper Lee has remained famously detached from interpreting the novel since the mid-1960s. However, she gave some insight into her themes when, in a rare letter to the editor, she wrote in response to the passionate reaction her book caused: "Surely it is plain to the simplest intelligence that To Kill a Mockingbird spells out in words of seldom more than two syllables a code of honor and conduct, Christian in its ethic, that is the heritage of all Southerners."

Question:
According to Lee, her book simply expressed a Christian code of honor and conduct inherit to whom?

all Southerners