North American English regional phonology

North American English regional phonology is the study of variations in the pronunciation of spoken North American English (English of the United States and Canada)—what are commonly known as the continent's regional accents or, simply, American accents. Though studies of regional dialects can be based on multiple characteristics, often including characteristics that are phonemic (sound-based, focusing on major word-differentiating patterns and structures in speech), phonetic (sound-based, focusing on any more exact and specific details of speech), lexical (vocabulary-based), and syntactic (grammar-based), this article focuses only on the former two items.

Source: Wikipedia — North American English regional phonology (CC BY-SA 4.0)