Language change in American English started when the initial speakers of English landed in North America. During the foundational stage, founder dialects were established in regions such as Tidewater, Virginia, Boston, Philadelphia, Charleston and New Orleans, which still maintain distinct varieties. As migration patterns emerged, dialects expanded largely along an east-to-west route that is still evident to this day, but more recent changes have reflected different migratory routes, such as the south–north migration route of African Americans and the more recent movement of Northern transplants to large urban areas of the South. We consider recent shifts in vowel systems, including the development of vowels systems in the Northern Cities Vowel Shift, the Northern California Vowel Shift and the weakening of the Southern Vowel Shift in Southern metropolitan areas. Finally, we examine the intersection of social and interactional factors with socio-regional space as these factors have nuanced the advancement of change in progress.