What comments about racism in the American South in the 1930s does Harper Lee make in To Kill a Mockingbird?I'd just like to get a more in-depth...

I think that author Harper Lee shows that racism was a
common fact of life in Alabama during the 1930s. Segregation was the norm: Whites and
blacks lived on different sides of town; they attended separate churches and schools;
and blacks were restricted from congregating at many other stores and public events.
Racism wasn't restricted to adults. Scout uses the "N" word regularly until Atticus
cautions her about it, calling it "common." We can assume that most white citizens of
the town use the "N" word, too; Atticus, Miss Maudie and some of their friends seem to
be the acception, not the rule. Nor was racism restricted to white people: Lula shows
her contempt of white folks when Calpurnia brings Jem and Scout to her all-black church.
The verdict in the Tom Robinson trial becomes the greatest example of how black people
are truly second (or third) class citizens: The word of Bob Ewell, the "disgrace of
Maycomb," is taken over that of Tom, and the jury disregards factual evidence to convict
the black man. Jem's description of Maycomb's social pecking order is accurate: There
are people like the Finches, the Cunninghams, the Ewells and, last, the
Negroes.