Gerrymandering is the deliberate manipulation of electoral district boundaries to favor a particular political party or group. This practice has become one of the most significant threats to fair representation in American democracy, fundamentally altering how votes translate into political power. When maps are gerrymandered, politicians and the powerful choose voters instead of voters choosing politicians. Understanding how gerrymandering works, its impact on communities, and the methods used to implement it is essential for every voter who wants to protect the integrity of democratic elections.

What Is Gerrymandering and Why Does It Matter?

Every 10 years, after the census, states redraw the boundaries of congressional and state legislative districts to reflect population changes, a process known as redistricting. While this process is necessary to ensure equal representation as populations shift, it also creates opportunities for political manipulation. The term "gerrymandering" originated in 1812 when Massachusetts Governor Elbridge Gerry signed a bill creating a district that resembled a salamander, leading critics to coin the term "Gerry-mander."

Redistricting is a chance for those in control of the process to rig maps to favor certain candidates or political parties, a practice known as partisan gerrymandering. In most states, the legislature controls the redistricting process, which means the party in power can draw maps that entrench their advantage for the next decade. This creates a fundamental conflict of interest where politicians choose their voters rather than voters choosing their representatives.

The consequences of gerrymandering extend far beyond election results. Partisan gerrymandering does more than distort representation in Congress. It undermines the belief that elections are fair, a cornerstone of democratic legitimacy. When citizens perceive that electoral outcomes are predetermined by map manipulation rather than voter preferences, it erodes trust in the entire democratic system.

How Gerrymandering Distorts Election Results

The power of gerrymandering to skew election outcomes cannot be overstated. The result is skewed, unrepresentative maps where electoral outcomes are virtually guaranteed, even when voters' preferences at the polls shift dramatically. In extreme cases, the party drawing the maps may even be able to win a majority of seats even though it wins only a minority of the vote.

The Brennan Center estimates that this gerrymandering will give Republicans an advantage of around 16 House seats in the 2024 race to control Congress compared to fair maps. This advantage can determine which party controls the House of Representatives, affecting everything from legislation to committee assignments to oversight responsibilities.

North Carolina provides one of the most striking examples of gerrymandering's impact. Under a court-drawn map, North Carolinians elected seven Democrats and seven Republicans in the 2022 midterms. Free to gerrymander, Republicans redrew the map, replacing the special master's 7–7 map with a legislatively drawn map that elected 10 Republicans and 4 Democrats in 2024. This dramatic shift occurred despite minimal changes in voter preferences, demonstrating how district lines alone can determine election outcomes.

In 2024, North Carolina Democrats won over 46 percent of the vote in congressional races (after adjusting for uncontested races), but a mere 29 percent of congressional seats. This stark disparity between vote share and seat allocation illustrates the fundamental unfairness that gerrymandering creates.

The Creation of Safe Seats and Reduced Competition

Gerrymandering's purpose is to reduce contestability by insulating seats from swings in voter opinion, shifting power to narrow primaries, and diluting cohesive communities, thereby predictably weakening electoral accountability. When districts are engineered to be noncompetitive, the real election happens in low-turnout primary contests rather than general elections.

Gerrymandering entrenches incumbents by design, converting general elections into "safe" seats and shifting accountability to narrow primaries. When districts are engineered to be noncompetitive in November, the decisive contest moves to low-turnout primaries, where smaller, less representative electorates set the outcome. This reduces the incentive for elected officials to respond to the broader electorate and encourages them to cater to the most partisan elements of their base.

The reduction in competitive districts has profound implications for governance. When representatives face no realistic threat of losing their seats in general elections, they have less incentive to compromise, work across party lines, or respond to constituent concerns. This contributes to increased polarization and legislative gridlock.

The Devastating Impact on Communities

Gerrymandering doesn't just affect election outcomes—it fundamentally undermines community representation and political power. Communities with shared interests, concerns, and identities are often deliberately divided or consolidated to dilute their voting strength.

Dilution of Minority Voting Power

Poor communities and communities of color are disproportionately impacted by gerrymandering, and as a result, their political power is diluted. This occurs through both racial and partisan gerrymandering, which often overlap in practice.

Continued residential segregation and racially polarized voting patterns, especially in southern states, mean that cracking or packing communities of color can be an efficient if cynical tool for creating advantages for the party in control of the map-drawing pen. While the Voting Rights Act of 1965 was designed to prevent racial discrimination in redistricting, recent Supreme Court decisions have weakened these protections, making it easier for states to draw maps that dilute minority voting power under the guise of partisan considerations.

The intersection of race and partisanship creates particularly insidious forms of gerrymandering. In states and localities around the country, naked partisanship is increasingly being used as an excuse for maps that dilute the voting power of the nation's fast-growing communities of color. This allows map-drawers to achieve racial discrimination while claiming their motives are purely partisan.

Breaking Apart Communities of Interest

Beyond racial considerations, gerrymandering often divides communities that share common interests, concerns, or identities. Cities may be split among multiple rural districts, neighborhoods may be separated from their natural economic centers, and communities with shared environmental or economic concerns may find themselves scattered across multiple districts with representatives who have little incentive to address their needs.

This fragmentation makes it difficult for communities to organize politically and advocate for their interests. When a neighborhood is split among three or four different districts, residents lose the ability to hold a single representative accountable for addressing local issues. The result is that some communities find their concerns systematically underrepresented in government, regardless of how they vote.

The Core Methods of Gerrymandering

Gerrymandering relies on sophisticated techniques to manipulate district boundaries. Understanding these methods helps voters recognize when their representation is being undermined.

Cracking: Dividing Opposition Voters

Cracking involves drawing districts in such a way as to divide a concentration of specific types of voters across several districts such that they are a minority in each one, with practically no hope of achieving representation in any of the districts. This technique is particularly effective when targeting concentrated urban populations or minority communities.

One cracking tactic is to dilute urban voting blocs by having multiple districts from the countryside converge like the spokes of a wheel at a city's fractured hub. For example, a city that could elect two representatives who reflect its urban priorities might instead be divided among five rural districts, ensuring that urban voters remain a minority in each district and unable to elect even a single representative who prioritizes their concerns.

Recent examples demonstrate cracking's effectiveness. In Tennessee, Republicans have proposed cracking Nashville for a different purpose: They want to divide Democratic votes between several districts that they have a great chance of winning. This prevents Nashville's urban voters from electing representatives who reflect the city's political preferences.

Packing: Concentrating Opposition Voters

Packing refers to the practice of drawing particular districts in such a way as to ensure that another party's candidate wins that seat by a tremendous margin. Although the opposing party is all but guaranteed the seat, packing makes surrounding districts less competitive, and thus tips the balance of power in the legislative body overall toward the ruling party.

Packing occurs when many supporters of the victim party are jammed into a small number of districts, giving them a few overwhelming wins. The remaining members of the victim party are then cracked, spread across a large number of districts, so that they consistently win just under 50% of the vote. This creates a distinctive pattern where the packed party wins a few districts by massive margins while losing many more districts by smaller margins.

The efficiency of packing lies in wasting opposition votes. If a party can win a district with 55% of the vote, any additional votes beyond that threshold are essentially wasted. By concentrating opposition voters into districts where they win with 75% or 80% of the vote, map-drawers ensure those extra votes cannot help the opposition win additional seats elsewhere.

Hijacking: Forcing Incumbents to Compete

Hijacking involves redrawing district boundaries to force incumbent representatives from the opposing party into direct competition with each other or into districts where they face significant disadvantages. This can occur by placing two incumbents in the same district, forcing them to compete in a primary, or by redrawing an incumbent's district to include a majority of voters from the opposing party.

This technique is particularly effective during redistricting cycles when the party controlling the process wants to eliminate specific opposition representatives. By carefully analyzing where incumbents live and where their support bases are located, map-drawers can create districts that make it nearly impossible for certain incumbents to win re-election.

Stacking: Combining Techniques for Maximum Effect

While cracking and packing are the primary gerrymandering techniques, sophisticated map-drawers often combine multiple methods to maximize their advantage. These two processes operate in tension with one another, but both can be implemented by a party in power seeking to maximize its electoral chances through gerrymandering.

The most effective gerrymanders use cracking in some areas and packing in others, depending on the geographic distribution of voters and the number of seats at stake. This creates a portfolio of districts that maximizes the map-drawer's party's seat share while minimizing the opposition's ability to win seats even when they receive a substantial share of the total vote.

Modern Gerrymandering: Technology Makes It Worse

While gerrymandering has existed since the early days of American democracy, modern technology has made it far more precise and effective. Sophisticated mapping software, detailed voter data, and powerful algorithms allow map-drawers to predict voting behavior with unprecedented accuracy.

Map-drawers now have access to data showing not just how precincts voted in past elections, but detailed information about individual voters' party registration, voting history, demographic characteristics, and even consumer behavior that correlates with political preferences. This allows them to draw districts with surgical precision, maximizing partisan advantage while maintaining the appearance of compact, reasonable-looking districts.

A smart gerrymanderer can create cracked and packed districts that look neat and square but nonetheless skew heavily in favor of one party. Although the districts lines might look normal, they sort voters with such careful precision that Republicans are virtually assured of winning 10 of the state's 14 congressional races and could win as many as 11 — a wildly skewed result for a perennial battleground state that regularly elects Democrats to statewide offices.

This means that voters can no longer rely on visual inspection to identify gerrymandered districts. While some gerrymandered districts have bizarre, contorted shapes, many modern gerrymanders use districts that appear compact and reasonable but are nonetheless carefully engineered to produce predetermined outcomes.

The Erosion of Democratic Legitimacy

Beyond its immediate effects on election outcomes, gerrymandering undermines the fundamental legitimacy of democratic governance. Survey data from tens of thousands of voters in the 2020 and 2022 elections show that Americans view gerrymandering with the same disdain they reserve for bribery and other blatant forms of political corruption.

Reduced Voter Participation and Engagement

When people believe elections are predetermined by politicians, rather than decided by voters, they may be less inclined to donate to candidates, volunteer, or even show up at the polls. This creates a vicious cycle where gerrymandering reduces competition, which reduces voter engagement, which makes it easier for incumbents to maintain power regardless of their performance.

The psychological impact of gerrymandering extends across party lines. Bowler's findings suggest the disillusionment crosses party lines. "Even if you're a Republican in Texas, you know cheating went on," he said. Even voters whose party benefits from gerrymandering recognize that the process undermines democratic legitimacy.

Weakening Electoral Accountability

Gerrymandering contributes to the erosion of public confidence in elections. It lessens people's sense that change can happen, and reduces the ability of voters to hold leaders accountable. When representatives know their seats are safe regardless of their performance, they have less incentive to respond to constituent concerns or work toward effective governance.

Accountability requires contestability: when a realistic chance of being replaced exists, elected leaders have reason to listen and adapt. Gerrymandering's purpose is to reduce contestability by insulating seats from swings in voter opinion, shifting power to narrow primaries, and diluting cohesive communities, thereby predictably weakening electoral accountability.

This erosion of accountability affects governance in concrete ways. Representatives from gerrymandered districts are more likely to take extreme positions, less likely to compromise, and less responsive to the concerns of constituents who don't belong to their party's base. This contributes to legislative gridlock and reduces the government's ability to address pressing challenges.

The Current State of Gerrymandering in America

After the 2020 census, Republicans controlled the redistricting process in more states than Democrats, and used this advantage aggressively. This has created a structural advantage that affects the balance of power in Congress and state legislatures across the country.

Despite a competitive environment nationally, Republicans enter the final stretch of the campaign benefiting from an artificial head start due to state-level gerrymandering. This advantage means that Democrats need to win the national popular vote by a significant margin just to have a chance at winning a narrow majority in the House of Representatives.

Regional Patterns and Disparities

Skewed maps give Republicans big advantages in 11 states, mostly in the South and Midwest. These advantages are particularly pronounced in states where Republicans control both the legislature and the governorship, giving them complete control over the redistricting process.

However, gerrymandering is not exclusively a Republican practice. Both parties engage in gerrymandering where they have the opportunity, though the current distribution of state-level power has given Republicans more opportunities to gerrymander in recent redistricting cycles. The issue is fundamentally about the structure of the redistricting process rather than the behavior of any particular party.

The Paradox of Over-Gerrymandering

Interestingly, aggressive gerrymandering can sometimes backfire. Gerrymandering may have made Republican seats safe, but by concentrating Republican voters in heavily Republican districts, it had the parallel effect of also making Democratic seats safe ones. But, ironically, Republicans' creation of so many super-safe GOP districts may have the limited the scale of Republicans' 2024 wins.

When a party creates too many safe seats for itself, it spreads its voters thin across multiple districts, leaving fewer voters available to capture additional seats in favorable election cycles. This can limit the party's ability to expand its majority even when national conditions favor it, creating a ceiling on potential gains.

The legal landscape surrounding gerrymandering has evolved significantly in recent years, with mixed results for those seeking to combat the practice.

The Supreme Court's Partisan Gerrymandering Stance

The Supreme Court has said federal courts won't referee claims of pure partisan gerrymandering. This landmark decision in Rucho v. Common Cause (2019) effectively removed federal courts from policing partisan gerrymandering, leaving the issue to state courts and legislatures.

The Court's reasoning was that partisan gerrymandering presents a "political question" beyond the scope of federal judicial review, as there is no clear constitutional standard for determining when partisan considerations in redistricting become excessive. This decision has had profound implications, essentially giving state legislatures free rein to gerrymander for partisan advantage as long as they don't violate other constitutional provisions.

State Court Interventions

While federal courts have stepped back from partisan gerrymandering cases, some state courts have been more willing to intervene. A Utah court just reminded the country who holds the pen in a democracy when it struck down its 2021 congressional map and ordered new lines consistent with voter-approved reforms, affirming that the people are the locus of political power and have a constitutional right to reform their government.

State courts in Pennsylvania, North Carolina (before a change in the court's composition), and other states have struck down gerrymandered maps under state constitutional provisions. These decisions demonstrate that state constitutions can provide protections against gerrymandering even when federal courts decline to intervene.

However, the effectiveness of state court intervention depends on the composition of state courts and the specific provisions of state constitutions. In some states, courts have been reluctant to second-guess legislative redistricting decisions, while in others, partisan shifts in court composition have led to reversals of earlier anti-gerrymandering precedents.

Racial Gerrymandering Remains Justiciable

While federal courts have declined to address partisan gerrymandering, they continue to hear cases involving racial gerrymandering under the Voting Rights Act and the Equal Protection Clause. However, the line between partisan and racial gerrymandering has become increasingly blurred.

When Black voters challenged the reconfigured district in federal court as an unconstitutional racial gerrymander, lawmakers defended the map based on politics — namely, the desire to make Mace's highly competitive district more reliably Republican. Targeting Black voters and their political power was just a means to an end. The Supreme Court agreed, finding that Black voters hadn't proven that the map's lines were based on race and not party affiliation.

This creates a significant loophole where map-drawers can achieve racial discrimination by claiming partisan motives, making it extremely difficult for minority communities to challenge maps that dilute their voting power.

Reform Efforts and Solutions

Despite the challenges, numerous reform efforts are underway to address gerrymandering and create fairer redistricting processes.

Independent Redistricting Commissions

One of the most promising reforms is the creation of independent or bipartisan redistricting commissions that remove the redistricting process from direct legislative control. Several states have adopted this approach through ballot initiatives or legislative action.

In many states, maps are much fairer than after the 2010 census, when single-party control of the redistricting process as a result of the midterms gave partisan line drawers free rein to craft some of the most extreme gerrymanders in American history. This redistricting cycle has seen notable improvement. State-level redistricting reforms in once-gerrymandered states (Michigan and Virginia), the increased willingness of state courts to enforce limits on partisan gerrymandering have contributed to fairer maps in some states.

Independent commissions vary in their structure and effectiveness. Some states use truly independent commissions with members selected through nonpartisan processes, while others use bipartisan commissions that require agreement between both parties. The most effective commissions have clear criteria for redistricting, transparent processes, and meaningful public input.

Federal Legislative Solutions

In 2022, Congress nearly passed the Freedom to Vote Act, a landmark package of democracy reforms that included a prohibition on partisan gerrymandering in the drawing of congressional districts. The transformative bill passed the House and had majority support in the Senate. It stalled only because the Senate failed by two votes to modify the chamber's archaic filibuster rules to allow the bill to advance to an up-or-down floor vote.

The Freedom to Vote Act would have established national standards for congressional redistricting, prohibited mid-decade redistricting, and created a presumption against maps that deviate significantly from partisan fairness. While the bill did not pass, it demonstrates that federal solutions to gerrymandering remain possible if there is sufficient political will.

Algorithmic and Mathematical Approaches

Researchers have developed sophisticated mathematical and computational approaches to detect gerrymandering and generate fairer alternative maps. These methods can identify when actual district maps deviate significantly from what would be expected under neutral redistricting criteria.

The efficiency gap, mean-median difference, and other statistical measures can quantify the partisan skew in district maps. Computer simulations can generate thousands of alternative maps that comply with legal requirements, providing a baseline for comparison with actual maps. When actual maps consistently favor one party compared to simulated neutral maps, this provides strong evidence of gerrymandering.

These tools have been used in litigation to demonstrate that fairer maps are possible and that actual maps reflect deliberate partisan manipulation rather than neutral application of redistricting criteria. However, courts have been inconsistent in their willingness to rely on these mathematical approaches.

Transparency and Public Participation

The better path forward is fair maps, drawn in public, by institutions answerable to the people, and an upgrade in how we elect leaders so that leaders are responsive and accountable to the broader electorates they serve. Increasing transparency in the redistricting process and ensuring meaningful public participation can help reduce the most egregious forms of gerrymandering.

Many states now require public hearings on proposed maps, publish mapping data and software, and allow citizens to submit their own proposed maps. While transparency alone cannot prevent gerrymandering when one party controls the process, it can increase public awareness and create political pressure for fairer maps.

What Voters Can Do

While gerrymandering is a structural problem that requires systemic solutions, individual voters and communities can take action to combat its effects and advocate for reform.

Stay Informed and Engaged

Understanding how redistricting works in your state is the first step toward effective advocacy. Learn who controls the redistricting process, what criteria are used, and when the next redistricting cycle will occur. Many nonpartisan organizations provide resources and information about redistricting in specific states.

Participate in public hearings and comment periods during redistricting. Submit testimony explaining how proposed maps would affect your community. Work with neighbors and community organizations to ensure that communities of interest are kept together rather than divided among multiple districts.

Support Reform Initiatives

Many states have ballot initiative processes that allow citizens to directly enact redistricting reforms. Support initiatives to create independent redistricting commissions, establish clear redistricting criteria, or increase transparency in the redistricting process.

Contact your state legislators and urge them to support redistricting reform. While legislators may be reluctant to give up control over redistricting, public pressure can make a difference, especially when reform is framed as a good-government issue rather than a partisan one.

Vote in Every Election

Even in gerrymandered districts, voting remains important. While gerrymandering makes some outcomes more predictable, it doesn't make them inevitable. High voter turnout can overcome even significant structural disadvantages, and voting in primary elections can influence which candidates represent each party.

Moreover, voting in state legislative elections is particularly important because state legislators often control the redistricting process. The party that controls state government during redistricting years has enormous power to shape district maps for the next decade.

Organizations like the Brennan Center for Justice, Common Cause, the League of Women Voters, and others bring legal challenges to gerrymandered maps. Supporting these organizations through donations or volunteer work helps fund the expensive litigation necessary to challenge unfair maps.

If you live in a state with a gerrymandered map, consider whether you have standing to join a lawsuit challenging the map. Courts often require plaintiffs who can demonstrate specific harm from gerrymandering, and your participation could be crucial to a successful challenge.

The Future of Fair Representation

The fight against gerrymandering is fundamentally about preserving the core promise of democratic government: that political power derives from the people and that elections provide meaningful opportunities for citizens to choose their representatives and hold them accountable.

Democracy is a promise that power originates from the people and can be reclaimed by them. Accountability is how that promise is kept. Without it, elections are merely a formality, and representation is simply a label, not a reality.

While gerrymandering has been a feature of American politics since the nation's founding, its increasing sophistication and effectiveness pose unprecedented threats to democratic governance. The combination of advanced technology, detailed voter data, and partisan polarization has created an environment where gerrymandering can entrench political power in ways that previous generations could not have imagined.

However, there are also reasons for optimism. Growing public awareness of gerrymandering, successful reform efforts in multiple states, and the development of sophisticated tools for detecting and measuring gerrymandering have created new opportunities for progress. The question is whether citizens and reformers can build sufficient momentum to overcome the entrenched interests that benefit from the current system.

The choice is not between one party's gerrymander and the other's; it's between a permanent power struggle and a system built for and accountable to voters. Creating fair redistricting processes requires moving beyond partisan advantage to embrace principles of fair representation, community integrity, and democratic accountability.

Conclusion: Protecting Democracy Through Fair Maps

Gerrymandering represents one of the most significant challenges to American democracy in the 21st century. By allowing politicians to choose their voters rather than voters choosing their politicians, it undermines the fundamental principle that government derives its legitimacy from the consent of the governed.

The effects of gerrymandering extend far beyond election results. It reduces electoral competition, weakens accountability, dilutes the voting power of minority communities, fragments communities of interest, increases polarization, and erodes public confidence in democratic institutions. These effects compound over time, as gerrymandered maps entrench political power and make reform increasingly difficult.

Yet the problem is not insurmountable. Independent redistricting commissions, clear redistricting criteria, increased transparency, mathematical tools for detecting gerrymandering, and engaged citizens can all contribute to fairer maps and more representative government. State courts, ballot initiatives, and federal legislation offer multiple pathways for reform.

The key is recognizing that fair redistricting is not a partisan issue but a fundamental question of democratic governance. Both parties have engaged in gerrymandering when given the opportunity, and both parties' voters suffer when the process is manipulated for partisan advantage. Creating systems that produce fair maps regardless of which party is in power serves the long-term interests of democracy and all citizens.

For voters concerned about the integrity of American democracy, understanding and combating gerrymandering is essential. By staying informed, participating in redistricting processes, supporting reform efforts, and holding elected officials accountable, citizens can help ensure that electoral maps reflect the will of the people rather than the interests of politicians.

The fight for fair representation is ongoing, and the outcome will shape American democracy for generations to come. Every citizen has a stake in ensuring that district maps are drawn fairly and that elections provide meaningful opportunities for voters to choose their representatives and hold them accountable. The future of democratic governance depends on our collective willingness to demand and defend fair electoral maps that serve the people rather than political parties.

For more information on redistricting and gerrymandering, visit the Brennan Center for Justice, the Princeton Gerrymandering Project, FairVote, the Common Cause Redistricting Program, or your state's election authority to learn about redistricting processes and reform efforts in your area.