English in the U.S. South contains a wide range of variation, encompassing ethnic, social class, and subregional variations all within the umbrella term of Southern English. Although it has been a socially distinct variety since at least the mid-19th century, many of the modern features it is nationally known for developed only after 1875. Lexical variation has long distinguished the U.S. South, but new vocabulary has replaced the old, and subregional variation in the U.S. South is no longer important for lexical variation. Social class still plays an important role in grammatical variation, but the rise of compulsory education limited previously wider ranges of dialect features. Despite traditional scholarship’s primary focus on lexical and grammatical language variation in the U.S. South, phonological variation has been the main area of scholarship since 1990s. Within phonological variation, the production of vowels, the most socially salient features of the U.S. South, has been a heavily studied realm of scholarship. Prosodic, consonant, and perception studies have been on the rise and have provided numerous insights into this highly diverse dialect region.