Typical for the East Coast where different cities have very different accents. Supposedly, it’s the “Coastal Southern” dialect which is different from Inland Southern dialects. It’s speculated that a Tidewater planter like George Washington wouldn’t have sounded much like much like what we’ve come to understand as a “Southern accent.”
Virginia has very different Southern dialects. Stonewall Jackson was from Clarkburg, VA, which is now West VA. So I guess old Stonewall would have a pretty think Southern accent.