We focus upon pairs of words very often which are the same in some areas and different in other areas.
William LabovIt appears that the present-day form of African American English is not the inheritance of the period of slavery, but the creation of the second half of the 20th century.
William LabovHowever, research in the years that followed found that in many of its important features, African American Vernacular English was becoming not less, but more different from other dialects.
William LabovBut unlike European countries, America has never finished a map of the United States, only the eastern United States is covered and a few spots here and there.
William Labov