North Carolina and other southern states are court ordered to draw certain minority-majority districts. You can't eliminate the only black district in NC without adding another one.
BTW, drawing minority majority districts is actually gerrymandering for Republicans. The US house is gerrymandered to favor Republicans. The way gerrymandering works is to pack in the voters that you don't want into one district and spread your voters out among several districts. Anyone who's not a retard knows this.
Ungerrymandered:
Overall votes: 49% R, 51% D
Overall seats: 0 R, 3 D
District 1: 49% R 51% D
District 2: 49% R, 51% D
District 3: 49% R, 51% D
In reality you'd probably want to draw one more conservative district to be fair, but I made the votes even just to be simple.
Gerrymandered:
Overall votes: 49% R, 51% D
Overall seats: 2 R, 1 D
District 1: 5% R, 95% D
District 2: 71% R, 29% D
District 3: 71% R, 29% D
If you pack a bunch of black people into one district and it goes 99% Democratic each time, that's a bunch of wasted votes that could be electing Democrats with smaller majorities elsewhere.