Technology
Redistricting, Gerrymandering, and Racial Vote Dilution
Quick fact
The term 'gerrymander' was coined in 1812 when Massachusetts Governor Elbridge Gerry signed a redistricting plan that created a salamander-shaped district, and a cartoonist dubbed it the 'Gerry-mander'. Since then, partisan and racial gerrymandering have been repeatedly challenged in courts, and racial vote dilution was explicitly outlawed by the Voting Rights Act of 1965 and its amendments.
Why this is interesting
Have you ever looked at a voting district map and seen a shape that looks like a dragon or a snake? That’s not an accident—it’s a tool that can decide who wins elections and whose voice gets heard.
Read the full explanation
Understanding Redistricting, Gerrymandering, and Racial Vote Dilution
Think of a state divided into voting districts, each sending one representative to Congress or a state legislature. After each census, these districts are redrawn to keep populations equal. But the people drawing the lines can also decide who lives together in each district. By moving boundaries, they can concentrate opposing voters into a few districts ('packing') or scatter them across many districts where they’ll be outvoted ('cracking'). When this manipulation targets a racial minority, it can dilute their voting power—even if everyone can legally vote. For example, if African Americans are 30% of a state’s population, they could be drawn so that they are a minority in every district, preventing them from electing a candidate of their choice. This is exactly what the Voting Rights Act aimed to stop.
A deeper explanation
Racial vote dilution is the process by which district lines are drawn to reduce the electoral influence of a racial minority group. The key mechanism is the coalition problem: even if a minority group votes cohesively, if they are spread too thin ('cracked'), they cannot reach a majority in any district. Conversely, 'packing' puts many minority voters into one district, wasting their votes. The Supreme Court recognized this as a violation of the Fourteenth and Fifteenth Amendments, and Congress addressed it in Section 2 of the Voting Rights Act, which prohibits any voting practice that results in the denial or abridgment of the right to vote on account of race. Courts use a three-part test (the Gingles test) to determine if a minority group is geographically compact, politically cohesive, and likely to elect its preferred candidate if not diluted. In remedy, courts may require the creation of majority-minority districts, but this has created tension because concentrating minority voters can also reduce their influence in surrounding districts. This is the paradox of racial gerrymandering: while it can help minority representation, it can also be used to 'protect' incumbents or influence overall partisan balance. Understanding this complex interplay is crucial for evaluating any redistricting plan and its impact on political equality.