But 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.

It 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.

I am now completing research supported by NSF and NEH that is mapping changes in the English language through all of North America, for both mainstream and minority communities.

William Labov Quotes