The most consequential decisions in American democracy are often made not by voters but by cartographers. Every ten years, following the census, state legislatures and appointed commissions sit down with demographic data and digital mapping software to redraw the boundaries of congressional and state legislative districts. The stated goal is to reflect population shifts. The actual result, more often than not, is a carefully engineered electoral landscape that protects incumbents, marginalizes opposition voters, and locks in partisan advantages that can persist for a decade or longer.
Gerrymandering—named for Massachusetts Governor Elbridge Gerry, whose 1812 state senate map included a district so contorted it resembled a salamander—is not a bug in the American system. It is a feature, one that both major parties have exploited with increasing sophistication as computing power has made precision targeting of voters trivially easy.
The two techniques that rig the game
Modern gerrymandering relies on two complementary strategies. "Packing" concentrates opposition voters into as few districts as possible, allowing them to win those seats by overwhelming margins while wasting their numerical strength. "Cracking" does the opposite: it disperses opposition voters across multiple districts so they constitute a minority in each. A skilled mapmaker can combine these techniques to create a state where one party wins, say, 60 percent of legislative seats with only 45 percent of the statewide vote.
The mathematics are straightforward. If Party A has 500,000 voters and Party B has 500,000 voters spread across ten districts, an impartial map might produce five seats for each. But if Party A controls the mapping process, it can pack 200,000 Party B voters into two districts—which Party B wins with 80 percent margins—while cracking the remaining 300,000 across eight districts where Party A holds narrow but consistent majorities. Party A wins eight seats; Party B wins two. Same voters, radically different representation.
Why courts have largely stood aside
The Supreme Court has repeatedly declined to establish a constitutional standard for partisan gerrymandering. In Rucho v. Common Cause (2019), the Court ruled that such claims present "political questions" beyond the reach of federal courts, effectively leaving the practice to state legislatures and state courts. The reasoning was that no judicially manageable standard exists to determine when partisan line-drawing crosses from acceptable politics into unconstitutional manipulation.
Racial gerrymandering remains subject to federal oversight under the Voting Rights Act, and courts have struck down maps that dilute minority voting power. But the distinction between racial and partisan gerrymandering has grown increasingly blurry, particularly in states where race and party affiliation correlate strongly. Mapmakers have learned to describe their intentions in partisan rather than racial terms, complicating legal challenges.
The reform movement's mixed record
Several states have transferred redistricting authority to independent or bipartisan commissions—California, Arizona, Michigan, and Colorado among them. These bodies have produced maps that outside analysts generally rate as more competitive and representative than those drawn by partisan legislatures. Yet commissions are not immune to political pressure, and their definitions of "fairness" vary considerably.
The deeper problem is structural. As long as someone must draw the lines, someone will have an incentive to draw them advantageously. Algorithmic approaches that optimize for compactness, population equality, and preservation of existing political boundaries can reduce human discretion but cannot eliminate it entirely—the choice of which criteria to prioritize is itself a political decision.
Our take
Gerrymandering persists because it serves the interests of those with the power to abolish it. Incumbents of both parties benefit from safe seats; party leaders benefit from predictable majorities. The losers are voters who find their choices constrained before they ever enter a polling booth, and a political culture that rewards extremism over moderation because the only competitive elections occur in primaries. The practice is legal, bipartisan, and corrosive—a reminder that in American democracy, the rules of the game often matter more than how the game is played.
