American literary regionalism

American literary regionalism or local color is a style or genre of writing in the United States that gained popularity in the mid to late 19th century into the early 20th century. In this style of writing, which includes both poetry and prose, the setting is particularly important and writers often emphasize specific features such as dialect, customs, history, and landscape, of a particular region: "Such a locale is likely to be rural and/or provincial."

...
Wikipedia