Redistricting reshapes political boundaries, usually once a decade after the census

The census reshapes House representation every 10 years

Conducted once every 10 years, the US Census determines how House seats are reapportioned among the states. The 2020 results shifted representation as state population growth and decline altered the geographic balance of political power.

Mid-decade redistricting is historically rare in modern US history

States have generally redrawn districts only once per decade following the census, with mid-decade redistricting occurring infrequently and usually prompted by court orders or unusual political circumstances.

Track the unusual push for mid-decade redistricting across the US

The National Conference of State Legislatures maintains a live tracker showing where mid-decade congressional redistricting is underway, detailing which states are pursuing new maps, the legislative and constitutional methods being used, and how courts are responding as the 2026 elections approach.

Independent redistricting commissions aim to take politics out of the map-drawing process

In several states, citizen or bipartisan panels draw congressional and legislative districts based on neutral criteria like population and geography. Learn more about how these commissions increase competitiveness in elections.

In 2025, Democratic-led states moved to counter with their own redistricting plans

In response to Republican mid-decade redistricting efforts, Democratic leaders in California, New York, Illinois, and Maryland signaled plans to revisit their own congressional maps.

Republicans launched a mid-decade redistricting push in 2025

Beginning in Texas, Republican-controlled legislatures in Missouri, Florida, Ohio, and North Carolina moved to redraw maps before 2030—an uncommon mid-decade effort aimed at securing additional congressional seats.

Researchers found that 2020 redistricting tactics created safer districts and reduced competition

Studies of the 2020 redistricting cycle show that map-drawing strategies locked in predictable outcomes. The result was fewer competitive races, more incumbents shielded from challengers, and representatives less responsive to broader voter preferences.

Experts predict Republicans will gain seats from mid-decade redistricting in 2026

Analysts expect GOP-led states to net seats through mid-decade redistricting, while Democratic states face greater hurdles due to commissions and legal limits—tilting the likely outcome toward Republican gains in 2026.

States are constitutionally mandated to draw their own congressional districts

Under Article I, Section 4 of the US Constitution, state legislatures possess the authority to determine how congressional districts are drawn. However, Congress retains the power to alter these rules if it chooses to.

How algorithmic redistricting works

Computational methods are convincing a number of judges that some state district maps are drawn illegally. Here's a simple overview of how it works.

See the most oddly gerrymandered districts in the US

Based on input from redistricting experts and political scientists, this resource identifies and ranks the most extreme congressional gerrymanders of the 2020s, examining how map design, cracking, and packing reduce competition and distort representation across states.

Test your gerrymandering skills with this interactive game

This simulation demonstrates how packing and cracking alter election outcomes. See how shifting district lines can change representation—regardless of the overall makeup of the electorate.

Hear how gerrymandering is like 'Moneyball applied to politics'

In a 2016 interview, journalist David Daley explained how Republicans used data-driven targeting after the 2010 census to lock in durable advantages, comparing modern gerrymandering strategies to the analytics revolution in baseball.

There were fewer competitive districts in 2022 than at any point since 1970

Analysts reported that the 2022 midterms featured the lowest share of competitive congressional districts since 1970, reflecting how modern redistricting has increasingly produced safe seats and reduced voter choice.

Most US House seats stay with the same party for decades

An analysis by the Pew Research Center shows that since the 1920s, the vast majority of House districts have been consistently won by the same party, with only a small share regularly changing hands. This highlights the large advantage incumbents have in House elections.

Can courts end partisan gerrymandering?

This podcast explored whether courts can rein in partisan map-drawing, focusing on North Carolina's 2023 redistricting battle, the Moore v. Harper case, and the controversial "independent state legislature" theory.

A 2013 Supreme Court case weakened federal oversight of redistricting

In Shelby County v. Holder, the Supreme Court struck down the Voting Rights Act's preclearance formula, reducing federal oversight of voting laws—including redistricting—and allowing changes to take effect without prior approval.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

Cracking and packing are gerrymandering techniques. Cracking splits opposing voters across districts, diluting their power. Packing concentrates their votes into a few districts, wasting them in overwhelming majorities for one party.

Red and blue election maps are a modern media invention

The red–blue color scheme used on election night maps emerged in the 20th century as television networks adopted color graphics to make results easier to follow. The association of red with Republicans and blue with Democrats later became standardized.

16 states impose term limits on their legislatures

As of 2025, 16 states limit how long lawmakers can serve, usually capping tenure at eight to 12 years in one chamber or across both chambers combined. Most of these limits stem from a 1990s reform wave aimed at curbing career politicians.

Breaking down the House races

All 435 voting seats in the US House are up for election, but less than 10% of them are competitive. See a breakdown of the races and which way they are leaning here.

Thousands of state voting changes have been federally blocked since the Voting Rights Act

Since 1965, federal oversight has blocked thousands of state-level voting changes—including redistricting plans—by requiring approval for measures that could affect minority representation, a process scaled back by the Supreme Court in 2013.

Which Senate seats are up for election, and how they are leaning

There are 14 Democratic and 21 Republican Senate seats up for grabs. See the Cook Political Report's continuously updated estimates on how they're leaning.

As of 2022, Congress was more ideologically polarized than at any point in 50 years

Research from the Pew Research Center indicates that Democrat and Republican lawmakers have become more ideologically unified internally while moving further apart overall—with Republicans shifting to the right faster than Democrats have shifted to the left.

How partisan is your district?

The highly-respected Cook Political Report rates how partisan--and therefore, how safe--every district in the US is. Hover over your home district to see the score.

Each state’s Electoral College votes mirror its representation in Congress

This overview explains how states receive electors equal to their senators and representatives, and details the legal framework governing how the Electoral College functions during presidential elections.

This American Life explored Ohio's gerrymandering battle

In 2022, Ohio lawmakers repeatedly drew congressional districts that the state Supreme Court ruled unconstitutional. This defiance violated a voter-approved reform intended to prohibit partisan gerrymandering.

Three ways the US population will change over the next decade

This article lists the top three ways the US population will change over the next decade. Using population data from the US Census Bureau and the UN Population Division, the piece explores what America might look like 10 years from now, which...

Congressional committees quietly shape most legislation

This video explains how 20 congressional committees—standing, select, and conference—perform much of Congress's work, from drafting legislation and holding hearings to overseeing executive branch agencies.

Visualize every time Congress has mentioned the word 'democracy' since 1880, and why

This Pudding interactive analyzes every mention of "democracy" in the Congressional Record over 145 years, charting how the word shifted from a partisan label to a concept, and tracking when lawmakers warned the system itself was under threat.

Critics say that the Electoral College is outdated and favors small states

This article argues that the Electoral College no longer reflects modern democratic norms, disproportionately advantages smaller states, and warrants broader reform and national debate. (Some readers may experience a paywall.)

The South was placed under federal military rule during Reconstruction

Beginning in 1867, the Reconstruction Acts divided 10 former Confederate states into five military districts, each governed by a Union general. Federal troops supervised elections, enforced civil rights, and maintained order under direct congressional authority.

The Great Compromise created Congress's two-chamber structure during the Constitutional Convention

The Great Compromise of 1787 established a bicameral Congress, balancing population-based representation in the House with equal representation for each state in the Senate—a system designed to reconcile the competing interests of large and small states.

Congressional turnover was far more common in the early republic

Many early lawmakers served just one or two terms before stepping aside, reflecting the ideal of the citizen legislator and the discomforts of living in Washington, DC. Longer careers in Congress became typical only later in the 19th century.

Research shows that termed-out lawmakers become less active

A University of Chicago and Stanford study found that state legislators barred from reelection sponsor fewer bills, serve on fewer committees, and skip more votes. The research suggests lawmakers are more productive when future elections remain possible.

Breaking down the gubernatorial races

Thirty-six states are holding gubernatorial races this November. Here's a breakdown of which states are holding elections, who is running, and which way the race is leaning.

The Voting Rights Act reshaped federal protection of voting rights

Signed into law in 1965, the Voting Rights Act aimed to end racial discrimination in voting. This resource traces its creation and explains how later court rulings have weakened its enforcement power over time.

How demographics influence voter turnout and elections

This article breaks down demographic data to show what it means for American elections. According to the latest US Census, the US is growing increasingly diverse. As the population becomes more diverse, so does the electorate. Analyzing the...

Southern states enacted voting restrictions aimed at circumventing Reconstruction

After 1877, former Confederate states passed poll taxes, literacy tests, property requirements, and grandfather clauses to disenfranchise Black voters—restrictions that remained in place for nearly a century until the Voting Rights Act of 1965.

How the US took half of Mexico

In just two years, the United States redrew the map of North America. Sparked by border disputes in Texas and fueled by President James Polk’s drive for expansion, the Mexican–American War (1846–1848) reshaped both nations.

US marshals conducted the national census for nearly a century

From 1790 to 1870, US marshals handled the national census, gathering population data from every district. The responsibility was gradually transferred to a separate federal office that would officially become the Census Bureau in 1902.

The powers of local government are rooted in state law, not the Constitution

Unlike the federal government or the states, local governments have no constitutional standing—they exist only because state law allows them to. A state legislature can redraw a city's boundaries, strip its powers, or dissolve it entirely.

Why Congress doesn't have term limits

Eighty-seven percent of Americans want term limits for Congress. So why don't they exist? The Founders debated this in 1787 and chose not to include them, believing elections would be enough. In the 1990s, 23 states tried to make it happen—until the Supreme Court struck them all down in a 5-4 decision.

Ranked-choice voting redistributes ballots until a candidate wins a majority

In ranked-choice voting, voters rank candidates in order of preference. If no one wins a majority, the lowest-ranked candidate is eliminated, and their votes are reassigned until a candidate surpasses 50%, avoiding separate runoff elections.

US school distrists have greatly consolidated since 1940

Consolidation significantly decreased the number of independent school districts from approximately 117,000 in 1940 to just over 13,000 today, mainly driven by efforts to boost efficiency and balance funding across communities.

Thomas Hofeller was the GOP strategist known as the 'master of gerrymandering'

Republican consultant Thomas Hofeller quietly shaped US politics for decades by engineering partisan maps nationwide. His files, released after his death, revealed strategies to maximize GOP advantage and diminish Democratic influence.

An interactive map of race and ethnicity across the US

This map by CNN shows race and ethnicity across the United States. America is more diverse and has more people than ever before. According to the 2020 census, much of its growth is occurring in and around metropolitan areas. By plotting the US...

The House of Representatives controls the $7T federal budget

The House holds the exclusive "power of the purse" to initiate revenue bills, a provision in the US Constitution designed to divide power with the Senate and give states with larger populations greater influence over federal budgeting.

Zoning laws determine what can be built—and where—in every American community

Local governments use zoning to regulate land use. About 75% of residentially zoned land in American cities is designated for single-family homes only—a restriction that some experts blame for increasing housing costs and reducing affordability.

A summary of the 2020 census

This summary of the 2020 census shows an aging America and wide racial gaps between generations. The information provides the national and geographic composition of the nation’s age and racial-ethnic makeup. New statistics for 2020 show that the...