"Y'all" has been called "perhaps the most distinctive of all grammatical characteristics" of Southern American English, as well as its most prominent characteristic. People who move to the South from other regions often adopt the usage, even when other regional usages are not adopted. Outside the southern United States, "y'all" is most closely associated with African-American Vernacular English. African Americans took Southern usages with them during the twentieth-century exodus from the South to cities in the northeastern United States and other places within the nation. In urban African-American communities outside of the South, the usage of "y'all" is prominent.