Regionalism, when used in connection with literature, is usually referring to depiction of local color. The text is attempting to provide the reader with the feel, the atmosphere of the setting of the story. In the case of The Help, Stockett created incidents and insights to guide the reader to an understanding of the attitudes held by most whites toward the "colored" help
I'm pretty sure I can say that no one in my family ever asked Demetrie what it felt like to be black in Mississippi, working for our white family. It never occurred to us to ask. It was everyday life. It wasn't something people felt compelled to examine.
and by the blacks toward their employers
Ever morning, until you dead in the ground, you gone have to make this decision. You gone have to ask yourself, "Am I gone believe what them fools say about me today?"
Realism is simply portraying life as it is, without any particular purpose, such as helping in the understanding of the setting of the story. Stockett's descriptions of the houses and surroundings in Jackson do support the understanding of regional biases, but are basically straightforward and realistic.
Naturalism is an approach to literature that holds that the character of persons is shaped by the social surroundings in which they live. Naturalism endeavors to illustrate the ways in which lives are impacted by the forces of other persons and ideas around them. Skeeter's personality was obviously shaped in reaction to the ideas and actions of many of the other young white women in Jackson.
I head down the steps to see if my mail-order copy of Catcher in the Rye is in the box. I always order the banned books from a black market dealer in California, figuring if the State of Mississippi banned them, they must be good.