The most consequential political battles in America are not fought in November. They are fought in the years ending in one, in state capitols across the country, by legislators armed with demographic data and mapping software, drawing lines that will shape representation for the next decade.
Gerrymandering—the manipulation of electoral district boundaries for partisan advantage—is as old as the republic itself. The term dates to 1812, when Massachusetts Governor Elbridge Gerry approved a district so contorted it resembled a salamander. But the practice has been refined into something far more sophisticated than Gerry could have imagined. Modern redistricting combines census data, voting history, and algorithmic precision to produce maps that can virtually guarantee outcomes before a single ballot is cast.
The mechanics of manipulation
Two techniques dominate the gerrymanderer's toolkit: packing and cracking. Packing concentrates opposition voters into as few districts as possible, ensuring they win those seats by overwhelming margins while wasting surplus votes. Cracking disperses opposition voters across multiple districts, diluting their influence so they fall just short of a majority everywhere. The ideal gerrymander combines both, creating a handful of landslide districts for the other party while securing narrow but reliable victories across the remaining seats.
The mathematics are ruthless. A party winning 55 percent of the statewide vote can, with skillful line-drawing, capture 70 or 80 percent of legislative seats. The inverse is also possible: a party with minority support can secure majority representation. This is not hypothetical. It has happened repeatedly in states where one party controls the redistricting process.
Why courts struggle to intervene
Judicial efforts to constrain gerrymandering have produced a fragmented and often contradictory body of law. Racial gerrymandering—drawing lines to dilute minority voting power—violates the Voting Rights Act and the Equal Protection Clause, and courts have struck down numerous maps on these grounds. But partisan gerrymandering exists in a different legal category. The Supreme Court ruled in 2019 that federal courts cannot adjudicate claims of excessive partisan gerrymandering, deeming such questions beyond judicial competence. The matter was left to state courts, state constitutions, and the political process itself.
This has produced a patchwork of outcomes. Some state courts have aggressively policed partisan maps under their own constitutional provisions. Others have deferred to legislative prerogative. A handful of states have transferred redistricting authority to independent commissions, removing the process from direct legislative control. But in most of the country, the party that wins the state legislature in a year ending in zero controls the maps for the following decade.
The self-reinforcing cycle
Gerrymandering does more than determine which party holds power. It shapes the character of that power. When districts are drawn to be safely partisan, the real competition shifts from general elections to primaries, where more ideologically motivated voters dominate. This pushes candidates toward their party's poles, rewarding those who appeal to the base rather than the median voter. The result is a legislature populated by members who have little electoral incentive to compromise and considerable incentive to perform for their most engaged supporters.
The feedback loop is difficult to break. Legislators elected through gerrymandered maps have no interest in reforming the system that elected them. Voters in safe districts may not even recognize the problem, since their preferred party keeps winning. And the technical complexity of redistricting—the dense thicket of census blocks, precinct boundaries, and demographic projections—makes it difficult for the public to engage meaningfully with the process.
Our take
Gerrymandering is not a bug in American democracy; it is a feature that has been present since the founding. What has changed is the precision of the tools available to those who draw the lines. The question is not whether politicians will seek partisan advantage—they always have and always will—but whether the system can impose meaningful constraints on that impulse. Independent commissions are an imperfect solution, vulnerable to their own forms of capture and manipulation. But they at least introduce friction into a process that has become frictionless. The alternative is a system where voters do not choose their representatives; representatives choose their voters.
