Several of the northeastern counties are majority black. Those counties vote for Democrats.This is probably the answer. I suspect that statewide it would still be similar but you would see more Urban counties and therefore more blue counties making the list.
Surprised that there are that many blue counties Northeast of Raleigh. Not sure how they can gerrymander that. I know Eastern North Carolina used to be a big Democratic stronghold but don't know why the southeast flipped and the Northeast stayed.
- Halifax: 51% black, 39% white (D)
- Northampton: 55% black, 39% white (D)
- Bertie: 60% black, 35% white (D)
- Hertford: 57% black, 31% white (D)
- Pasquotank: 35% black, 53% white (D - barely)
- Gates: 29% black, 64% white (R - before Trump it had only voted Republican in 1972)
- Washington: 49.6 black, 45.3 white (D)
- Chowan: 32% black, 60% white (R)
- Camden: 10% black, 79% white (R)
- Currituck: 5% black, 84% white (R)
- Dare: 2% black, 86% white (R)
- Tyrrell: 29% black, 58% white (R)
- Perquimans: 21% black, 72% white (R)
- Hyde: 25% black, 64% white (R)
- Beaufort: 23% black, 66% white (R)