How gerrymandering decided control of House of Representatives

https://www.brennancenter.org/our-work/analysis-opinion/how-gerrymandering-and-fair-maps-affected-battle-house

Gerrymandering in North Carolina alone provided Republicans with enough seats to win the House. Democrats won 7 seats by gerrymandering, and Republicans won 23 that way. The net margin may end up being as little as one seat.