Maybe a geek post.
American states have representatives in the US Congress and they have state legislatures, and both of these are based on "districts", where each district contains approximately the same number of people, based on the census.
Seems legit, I spoze. But here's the thing: who actually gets elected depends on how those districts are drawn on the map.
Manipulating those maps in order to favor a particular party is called "gerrymandering".
Wait. It's geekery, I promise.