Map of Dominican provinces in the United States since 1980 (Order of Preachers).
Formal names:

Western = Province of the (Most) Holy Name of Jesus
Central = Province of Saint Albert the Great
Southern = Province of Saint Martin de Porres
Eastern = Province of Saint Joseph (the Worker)
This vector image includes elements that have been taken or adapted from this file:
AnonMoos, based on previous map files by others