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.
The parties look at past polling data and draw up the districts to give them advantages. Here in Ohio, there is a district that a democrat barely lost. The trouble is that the city votes democratic and the outlying rural areas are republican. So each district is mostly out in the country but then a slice comes down into the city. Result? 52% republican, rest democrat. In the last election though, the republican barely won. If the district was drawn fairly, and that slice was consolidated, the democrat would have won easily. It cost the democrats several seats because of gerrymandering.
Thanks. Lie if you are polled, to screw up gerrymandering.