The "southern part of the south", which I think you mean Southern Virginia, is also become more Mid-Atlantic and less Southern as time goes on. There aren't really any true "Southern" parts of Virginia anymore.
Not really true. Once you get out of the core NOVA counties, you start seeing Confederate Flags and hearing Southern Accents. Of course, as NOVA continues to grow, it's demographic dominance of the state will become increasingly cemented. Maryland still has regions that are culturally Southern, though few would consider it a Southern state nowadays.
