Starting last year, President Donald Trump persuaded eight states controlled by Republicans to carve up their electorates through unapologetic partisan gerrymandering. The plan was supposed to offset the governing party’s typical midterm losses and guarantee that Republicans retained their House majority.

After American politics shifted right in 2024, Trump and his GOP allies acted as though carefully selected district lines could lock their party into power. That confidence rested on hubris, greed and a stack of assumptions that collapsed spectacularly on Tuesday.

Democrats recorded their biggest night in decades, while Republicans got wrecked despite choosing the voters they believed would protect them. The result exposed the central weakness of gerrymandering: Voters do not always behave according to a party’s preferred political blueprint.

The GOP’s biggest mistake appears to have been assuming that voters who supported Republicans in 2024 would remain loyal. That ignored potential outrage over inflation, the war in Iran, unbridled corruption and Immigration and Customs Enforcement shooting people dead in the street.

By early June, at least 16 newly drawn districts had become more solidly Republican. At that point, the gerrymandering campaign looked capable of holding together Trump’s fracturing coalition and shielding vulnerable GOP incumbents.

By Wednesday, however, Republicans had flipped at most one of five redrawn seats in Texas and two of four in Florida. They also flipped one each in Tennessee and Louisiana, a remarkably thin return from such an aggressive effort to manipulate district boundaries.

North Carolina’s revamped 1st District will still likely remain with Democratic incumbent Rep. Don Davis. The Alabama seat held by Rep. Shomari Figures will certainly remain his, further dismantling Republican expectations for the redrawn map.

Ohio offered another brutal example of the plan’s failure. Its newly drawn map was intended to produce 12 safe Republican seats and only three Democratic seats, but instead at least seven Democrats are heading to Washington in January.

States have typically conducted redistricting after the Census, when new population figures can affect seat totals and reveal demographic changes. Republicans instead pushed redistricting in the middle of the decade using 2024 vote totals as the only new data available.

Along Texas’ southern border, where Trump performed better than expected among Hispanic voters, state lawmakers chopped and rearranged districts to protect GOP incumbents and eliminate Democrats. Florida then pursued its own version of the same strategy.

Republicans were effectively fighting the previous political battle with faulty analysis. Rather than viewing the 2024 results as a reaction to anger over high prices, they behaved as though Latino voters who supported Trump would remain permanently attached to the GOP.

The administration’s hostility toward migrant communities and the war against Iran made that assumption especially disastrous in the new Florida and Texas districts. Latino voters helped drive the wave that shifted most counties blue this year.

Farmers in rural counties also contributed while drowning in debt because of Trump’s tariffs and higher fuel prices connected to the Iran war. The GOP had drawn boundaries around a coalition it assumed would remain stable, only to watch that coalition move.

The Supreme Court’s further gutting of the Voting Rights Act gave southern states another opportunity to erase Black majority districts. That effort also helped rally Black communities against Republican redistricting campaigns.

With many Republicans deeply unmotivated to vote, every Democrat forced into a newly designed district made the GOP incumbent there less secure. Even districts gerrymandered during previous cycles could not withstand the strength of the Democratic surge.

Rep. Tim Moore’s North Carolina district was among them. On Wednesday evening, with 99% of ballots counted, Moore trailed Democrat Lakesha Womack by more than 6,400 votes, showing just how thoroughly Republican electoral barriers had failed.

California’s response deserves scrutiny as well, even though Gov. Gavin Newsom did not start the redistricting fight and California voters approved the new maps. Adding five more Democratic leaning seats to its 55 member House delegation still carries the sour taste of partisan mapmaking.

Yet California’s changes ultimately did not determine the result. MS NOW projected Democrats would hold at least 250 seats, while 245 seats would still have been comfortably enough to secure the House majority.

Tuesday’s outcome showed that the gerrymandering war Trump demanded was unnecessary. Republican maps failed to protect the party, while the Democratic scramble to counter those maps also became irrelevant to the final outcome.

Democrats also captured the House, the Senate, enough state legislatures and enough governorships to decide what comes next. One option is a renewed movement toward independent commissions that would take redistricting away from partisan lawmakers.

The new Democratic majority in Congress could also finish the work Democrats began six years ago and seek a uniform standard for federal redistricting. That would require support from members who depend on heavily manipulated districts, but the GOP’s mapmaking fiasco has made the case for thinking bigger.