Linguistic Geography of the Mainland United States

Traditionally, dialectologists have listed three dialect groups in the United States: Northern, Midland, and Southern--although some scholars prefer a two-way classification of simply Northern and Southern, and one may also find significant difference on the boundaries of each area. The map shown above represents a synthesis of various independent field studies this century.  http://www.evolpub.com/Americandialects/AmDialMap.html