There are few better illustrations of this than guns in the US. A consistent majority favours stricter gun laws, and support for background checks is almost unanimous. Yet thanks to a combination of big money, gerrymandering and political spinelessness, each mass shooting is received in a mood of learned hopelessness. Citing Sandy Hook, people understandably insist that if nothing changed when the kids were younger, and the president cried and called for action, then nothing ever will change.
つづいてCambridge Dictionaryではan occasion when someone in authority changes the borders of an area in order to increase the number of people within that area who will vote for a particular party or personと定義されています。由来はマサチューセッツ州知事Gerryが改変した選挙区の地形がsalamander「サンショウウオ」に似ていたことからgerrymanderとなったようです。