This article investigates the dialect boundary that separates the eastern and western halves of North Carolina using data collected by two very different projects, the Linguistic Atlas of the Middle and South Atlantic States (LAMSAS) and the Corpus of American Civil War Letters (CACWL). Using LAMSAS data collected in the 1930s from speakers born in the late-nineteenth century, Hans Kurath posited that such a boundary extended across North Carolina northward into Virginia and southwestward into South Carolina and that it demarcated the South Midland speech region from the South. An analysis of lexical and grammatical variants in the 2,299 letters (representing one million words) of the CACWL North Carolina sample provides important real-time...