In many states, the party with legislative control gets to re-draw the lines for congressional districts. Following the 2020 Census, Republicans will have the ability to re-draw 187 congressional districts. Democrats will only control 75.
Currently, maps can be drawn however the party in power wants, allowing them to create odd-looking districts that make little sense in order to maintain power.
Passing laws that require maps to focus on contiguous political districts, or communities that share political and geographical makeup, would eliminate some of the bias.
Another option: Hand over the mapmaking process to machines. There are several computer models that treat redistricting like a math equation rather than a political calculus.
It passed the House in March but was filibustered by Republicans in the Senate. The bill would require independent commissions to be established in every state to handle redistricting and would require bipartisan support for every proposed map.
Right now, it’s stalled. But other versions of the bill like the Freedom to Vote Act offer similar paths to addressing gerrymandering — if they can pass Republican opposition.