ThiS video explains an NC gerrymandering case that overturns GOP gerrymandering of that state. It also tells how gerrymandering can virtually guarantee one party (e.g., GOP) can win a super majority even when the voting majority favors the other party (e.g., Dems).

IDK how household party affiliation is determined, unless one is a registered as a party member. Ones vote is supposed to be secret. However, buying political signs, caps, buttons, etc. might be telling.

Anyway, we might develop strategies to foil gerrymandering. For example, join the opposition party, e.g., GOP, but vote otherwise, e.g., Dem. Although, it is possible being unregistered is enough. IDK how they get data to draw gerrymandered districts, but they can determine by address.