Demonstrators protest gerrymandering outside Supreme Court

Improvements in data collection and technology have transformed gerrymandering from a guessing game into a more precise formula.
Evelyn Hockstein for The Washington Post via Getty Images)

What’s happening

States have redrawn voter maps using 2020 census data, raising accusations of partisan redistricting in dozens of districts.

Why it matters

Gerrymandering can disenfranchise voters, skew election results and determine which party controls Congress.

What’s next

In October, the Supreme Court heard arguments in an Alabama gerrymandering case that could further dismantle the Voting Rights Act of 1965.

Election Day is almost here, and many Americans have discovered they’ve been moved to a new district as a result of redrawn voter maps based on data from the 2020 US Census.

Partisan redistricting, also known as gerrymandering, can give one party an unfair advantage in an election. On Oct. 3, the Supreme Court heard arguments in Merrill v. Milligan, which looks at whether Alabama is obligated to create a second Black-majority congressional district under the Voting Rights Act of 1965.

Citizen NowCitizen Now

Civil rights organizations argue that the state’s Repub­lican-controlled legis­lature packed most people of color into the 7th District, then divvied up the rest of the Black electorate into six white-major­ity districts, diluting their ability to impact elections. 

Gerrymandering is one of the biggest political issues the Supreme Court will face in this session — and the subject of more than two dozen ongoing court battles. 

Changes to voter district maps will likely have a major impact on which party controls Congress after the midterms.

Though gerrymandering has long been an issue, “the level of polarization today gives stronger incentives for both parties to use whatever edge they can,” Nick Seabrook, a political scientist at the University of North Florida and author of One Person, One Vote: A Surprising History of Gerrymandering in America, told CNET.

“The difference between a Republican or a Democratic majority is so extreme, there’s zero overlap anymore,” Seabrook said. “So the implications of who controls the House or Senate is so much more important.”

The rapid improvement in data collection and technology has also turned gerrymandering from a guessing game into a more precise formula.

Here’s what you need to know about gerrymandering, including how it influences elections, how it’s changed in recent years and what impact it’s having on our democracy.

Read on: Our Election System is Under Assault by Misinformation

What is gerrymandering

Since the 1960s, state and local governments have had to redraw voting districts every 10 years based on information gleaned from the most recent US census. All districts must have roughly the same population, but when officials intentionally skew the boundaries to favor one party or one type of voter, it’s considered gerrymandering.

The phrase “gerry-mander” was coined by early 19th century Federalists in response to the partisan redrawing of Massachusetts Senate election districts in 1812 to heavily favor the now-defunct Democratic-Republican Party.

An 1812 political cartoon depicting a 'Gerry Mander'An 1812 political cartoon depicting a 'Gerry Mander'

Political cartoonist Elkanah Tisdale depicted one of  Massachusetts’ distorted electoral districts as a mythological salamander in the Boston Gazette in 1812.  


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Massachusetts Gov. Elbridge Gerry signed the bill approving the redrawn map, forever linking him to the controversial practice. The term is a portmanteau of his name and the mythological creature known as a salamander (not to be confused with the real-world amphibian of the same name). 

Artist Elkanah Tisdale’s political cartoon in the Boston Gazette satirized Massachusetts’ contorted voting map by depicting one of the districts as a dragonlike creature.

What are ‘packing’ and ‘cracking’?

There are two main forms of gerrymandering: In the first, officials try to cram as many of the opposition’s voters as possible into a single district, a practice known as packing, to limit how many seats they control.

The opposite strategy, cracking, dilutes the other party’s base across so many different districts that they won’t be in the majority in any of them. 

How is the Supreme Court addressing gerrymandering?

Plaintiffs in Merrill v. Milligan — who include the ACLU of Alabama, the NAACP Legal Defense and Educational Fund, and Evan Milligan, executive director of the progressive nonprofit Alabama Forward — accuse Republican lawmakers of packing and cracking Alabama’s seven congressional districts to ensure that Black voters represented 56% of the 7th District, but no more than 30% in any other.

They claim that, despite representing nearly 28% percent of the state’s popu­la­tion, Black Alabamans can now only reasonably expect to impact elections in the 7th District — because of what the Brennan Center described as “high levels of racially polar­ized voting in the state.”

Their suit alleges that the partisan redistricting violated both the Voting Rights Act and the 14th Amendment’s Equal Protection Clause.

In January, a federal three-judge panel agreed, ordering Alabama to redraw its voter maps. But the state appealed and, in February, the Supreme Court agreed to hear the case and stayed the lower court’s order: As a result, even if the plaintiffs win, the contested map will be used in the 2022 midterm elections.

Gerrymandering is nothing new. Why is it such a big issue now?

Anti-gerrymandering demonstrators outside the Supreme CourtAnti-gerrymandering demonstrators outside the Supreme Court

Voting-rights activists say gerrymandering has become increasingly pernicious and sophisticated.

Olivier Douliery/Getty Images

To some extent, gerrymandering is a cyclical issue that arises every decades, said Michael Li, senior counsel for the Brennan Center for Justice at New York University Law School. And both parties have been accused of the practice.

“It’s been with us since the beginning of the country,” Li said in an interview. “It’s become more salient now, though, because it’s driving a lot of dysfunction in politics today.”

Historically, petitioners alleging gerrymandering could seek redress in federal court. Then, in 2019’s Rucho v. Common Cause, the Supreme Court ruled that weighing in on partisan redistricting was, as Chief Justice Roberts wrote in the majority opinion, “beyond the reach of the federal courts.”

“Federal judges have no license to reallocate political power between the two major political parties, with no plausible grant of authority in the Constitution, and no legal standards to limit and direct their decisions,” Roberts wrote.

His opinion was endorsed by the other members of the court’s conservative bloc: Justices Samuel Alito, Clarence Thomas, Neil Gorsuch and Brett Kavanaugh.

But Li called putting responsibility for policing voter district maps in the hands of state lawmakers “a disaster on multiple levels.” 

“It’s an unlevel playing field,” he said. “It allows for a lot of racial discrimination, in particular.”

District maps currently being drawn from 2020 census data are the first since Rucho. With Democrats maintaining only a slim majority in the House, creative redistricting in just a few critical districts could tilt control to the Republicans. And even in cases where courts are ruling maps are unconstitutional, there’s not enough time to redraw them before the midterms.

Seabrook says gerrymandering is killing democracy in the US.

“It’s creating an electoral system where the people in office aren’t representative of the popular will,” he said. “They represent whomever is in charge of redistricting.”

Entrenched gerrymandering is also allowing politicians to stay out of step with the electorate.

“It’s why issues like gun control, that have overwhelming support among the public, never go anywhere in Congress,” Seabrook said. 

How has gerrymandering evolved?

In the first half of the 20th century, lawmakers largely left district maps alone, ignoring demographic and population shifts that made districts woefully uneven. The situation often favored rural areas with dwindling populations but a high percentage of white voters.

In two 1964 decisions, Reynolds v. Sims and Wesberry v. Sanders, the Supreme Court declared that states must use the most recent census count to redraw state and federal districts and maintain equally represented populations.    

“So in fixing one problem, they created a whole new one,” said Seabrook. “Politicians realized they could really put their thumb on the scale.”

In the past, lawmakers could only estimate constituents’ voting habits, but the system has gotten more sophisticated, according to both Li and Seabrook. “Now we know so much more about voters — we can know where you shop, what you post on Instagram, even how strong a voter you are,” Li said. With computers, “you can draw thousands of maps or redraw lines a million different ways.”

Creating districts where the results are all but guaranteed “fuels the feeling the system is rigged,” Li added.

Some of the biggest redistricting battlegrounds

At least 31 legal challenges have been brought against redistricting maps this legislative cycle, the majority by Democrats over maps drawn by Republican-dominated legislatures. Several cases have broad implications.

North Carolina

In February, the North Carolina Supreme Court rejected the district maps drawn up by the Republican-controlled legislature as overly partisan and ordered both state legislature and congressional maps redrawn. 

The state appealed the case, Moore v. Harper, to the Supreme Court, which will hear arguments on Dec. 5.  

“This case presents an exceptionally important and recurring question of constitutional law, namely, the extent of a state court’s authority to reject rules adopted by a state legislature for use in conducting federal elections,” Justice Samuel Alito wrote in a decision to deny a stay of the lower court’s order.

A map of New York State divided into jigsaw puzzle piecesA map of New York State divided into jigsaw puzzle pieces

New York’s initial voter district map was struck down as a Democratic gerrymander.

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New York

With Republicans controlling more statehouses, gerrymandering can seem like a one-sided problem. But Democrats have also played the same games. When an independent commission couldn’t agree on a set of maps, New York’s Democratic-controlled legislature stepped in to draw its own lines, which Democratic Gov. Kathy Hochul quickly signed into law.

In April, the New York Court of Appeals struck down the map as a Democratic gerrymander and appointed special master Jonathan Cervas to devise a new, more balanced map. 

In May, Cervas finalized the state’s congressional and state Senate maps. But a state Supreme Court judge ruled in August that the Independent Redistricting Commission must submit new Assembly lines by April 2023 to be put in place for the 2024 election cycle.  


On Nov. 8, Ohio residents will vote based on a district map twice rejected by the state Supreme Court as unconstitutional. 

Republican leaders have appealed to the U.S. Supreme Court to overturn the state court’s ruling, which they call “fundamentally flawed.”

“While many believe that the Ohio Supreme Court majority misinterpreted state law, there is also the broader concern that the court assumed a role the federal constitution does not permit it to exercise,” House Speaker Bob Cupp said in a joint statement signed by Senate President Matt Huffman and others. “This is a matter that needs resolution by our nation’s highest court.”

Republicans leaders are endorsing the independent state legislature theory, which holds that lawmakers’ authority to draw congressional district maps can’t be overridden by a state supreme court. 

The ISL doctrine is “a dangerous fringe legal theory to excuse their bad behavior of rigging legislative districts to benefit themselves and their friends,” League of Women Voters of Ohio director Jen Miller told WVXU.

Republicans are also invoking the ISL theory in the North Carolina redistricting case currently before the US Supreme Court. 


Republican Gov. Ron DeSantis vetoed the GOP-controlled legislature’s congressional map this year and replaced it with his own plan that favored Republicans even more. (The Princeton Gerrymandering Project gave DeSantis’ map an “F” for partisan fairness.) 

DeSantis dismantled Florida’s 5th District — which is 48% Black and stretches from Jacksonville to Tallahassee — cracking it into four new Republican-heavy districts, each with a much smaller segment of Black voters. 

A state circuit court judge struck down DeSantis’ map “because it diminishes African Americans’ ability to elect candidates of their choice.”

Seabrook, who lives in Jacksonville, said Florida has had three decades of Republicans being in charge of redistricting.

“It just wears away the other side and discourages people from running for office,” he said. “We now have a state Supreme Court that is made of seven Republican appointees. The Democratic Party in Florida is pretty much a nonentity at this point.”

An appeals court  paused the ruling on DeSantis’ map, but in June the state Supreme Court declined to review the case. That means the governor’s redistricting plan will be used for the 2022 congressional elections.

It gives Republicans a 20-8 advantage in the state’s congressional delegation and will likely give the GOP an additional four seats in the House.

What’s the solution to gerrymandering?

In Congress, the John Lewis Voting Rights Advancement Act of 2021 would have restored parts of the Voting Rights Act of 1965, including the need for states with a history of voter discrim­in­a­tion to receive approval from the Depart­ment of Justice or a federal court before redrawing voting maps.

The bill passed the Democrat-controlled House in August 2021 but was blocked by Senate Republicans that November.

Seabrook believes the answer involves taking redistricting out of the hands of lawmakers altogether.

“The main problem with gerrymandering today is that politicians are drawing maps that either favor themselves or the party they belong to,” he said. The system “favors incumbent protection and partisan interest when it should be shifted toward protecting community interests.”

He advocates for impartial citizens’ commissions, like the ones used by California, Colorado and Michigan.

“Anyone can apply and they’re not appointed or tied to legislators,” Seabrook said. It’s a strategy employed in his native UK, as well. 

Bills to install citizens’ commissions have been introduced in numerous states, including North Carolina, where lawmakers are considering The Fair Maps Act, which creates an independent redistricting process.

“It doesn’t always produce districts that are 100% perfect, but they’re impartial,” Seabrook said. “If we did that in every state in the US, it would keep more seats competitive.”

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