The Northeast actually has a wide variety of accents, depending on what state you're in, even to some extent what city in a particular state. The coastal South has a distinctly different accent from the central South and Appalachian South, which also sound different. New Orleans is a breed of its own, as is Cajun Louisiana. One can even tell a difference in many of the Midwest areas, ie, Northern Michigan vs. Indiana and Southern Ohio, vs. Chicago or Minnesota. I think the most Un-accented folks are from the far coastal west, California, Washington, Oregon.