Published on The Democrat News

Redistricting and Gerrymandering: How District Maps Shape Elections

Every ten years, following the U.S. Census, congressional and state legislative districts are redrawn to reflect population changes. This redistricting process has enormous consequences for electoral outcomes — and it has become one of the most hotly contested areas of election law.

The Gerrymandering Problem

Gerrymandering — drawing district lines to benefit a particular party or group — is as old as American politics. The term itself derives from a 19th-century Massachusetts governor who approved a salamander-shaped district designed to benefit his party. Modern technology has made partisan gerrymandering far more precise and effective: sophisticated mapping software allows mapmakers to draw districts that reliably produce partisan outcomes even in competitive states.

Legal Standards

The legal landscape for challenging gerrymandering is complex. The Supreme Court ruled in Rucho v. Common Cause (2019) that federal courts cannot adjudicate partisan gerrymandering claims — the Court held that determining when partisanship has gone too far is a political question beyond judicial reach. This leaves partisan gerrymandering challenges primarily to state courts applying state constitutional standards, and to independent redistricting commissions in states that have established them.

Racial Gerrymandering

Racial gerrymandering — using race as the predominant factor in drawing district lines — remains subject to federal judicial review under the Equal Protection Clause and the Voting Rights Act. The Supreme Court's 2023 decision in Allen v. Milligan reaffirmed that Section 2 of the VRA requires states to create majority-minority districts in some circumstances, setting up continued litigation over how race and partisanship interact in the redistricting process.

Independent Redistricting Commissions

A growing number of states have responded to the partisan redistricting problem by establishing independent or bipartisan redistricting commissions. California, Arizona, Michigan, and Colorado are among the states where commissions — rather than legislatures — draw congressional and state legislative districts. The structures vary: some commissions are purely independent (no current officeholders or party officials may serve), while others are bipartisan, requiring equal representation from both major parties. Research on early commission-drawn maps suggests they tend to produce more competitive districts than legislature-drawn ones, though the effect varies significantly by state and commission design.

State Court Challenges

Following the Supreme Court's ruling in Rucho v. Common Cause that federal courts cannot police partisan gerrymandering, state courts applying state constitutional provisions have become the primary venue for partisan gerrymandering litigation. Courts in North Carolina, Pennsylvania, Ohio, and New York have all invalidated maps on state constitutional grounds. This state-by-state approach produces uneven results — some state constitutions provide strong anti-gerrymandering protections while others offer little — and creates ongoing legal uncertainty as courts interpret constitutional standards for the first time.

Section 2 of the Voting Rights Act

Racial gerrymandering and vote dilution claims under Section 2 of the Voting Rights Act remain a major source of redistricting litigation. Section 2 prohibits voting practices — including district-drawing — that result in the denial or abridgement of the right to vote on account of race. The Supreme Court's decision in Allen v. Milligan (2023) reaffirmed that Section 2 requires the creation of majority-minority districts in some circumstances, rejecting Alabama's argument that race-neutral maps should be presumed valid. This decision has prompted ongoing litigation in multiple Southern states where majority-minority populations are concentrated.

Technology and Modern Gerrymandering

Twenty-first-century redistricting has been transformed by computing power and granular voter data. Sophisticated mapping software can analyse precinct-level voting history, demographic data, and geographic information to draw maps that reliably produce desired partisan outcomes even in states that are genuinely competitive statewide. This precision has made traditional judicial standards for identifying gerrymanders — which were developed for cruder line-drawing techniques — increasingly inadequate. Reformers have proposed algorithmic fairness tests (such as the efficiency gap and mean-median measures) as more objective standards for identifying unconstitutional partisan advantage.

The 2030 Cycle

The next redistricting cycle will follow the 2030 Census. Battles are already beginning over state legislative control — which determines who draws maps in most states — and over which states will adopt independent commission models before then. The legal landscape will also be shaped by ongoing litigation under the Voting Rights Act, state constitutional challenges, and whatever further guidance the Supreme Court provides on racial and partisan gerrymandering standards in the interim period.