Final answer:
Redistricting becomes controversial primarily due to gerrymandering—manipulating district boundaries to favor certain political parties or groups, which potentially undermines fair representation in elections.
Step-by-step explanation:
One reason why redistricting is controversial is that those charged with drawing districts use sophisticated computer technologies to come up with the most favorable district boundaries.
The practice of manipulating district boundaries to favor a particular political party or group is known as gerrymandering. It is controversial because it can lead to unfair electoral outcomes by ensuring that certain districts are drawn in such a way that they predominantly favor incumbents or a specific political party, thus influencing election results.
During redistricting, the aim is to create districts that are relatively equal in population, adhering to the Voting Rights Act to avoid diminishing the voting strength of minorities.
However, technology has enabled a much more precise manipulation of district boundaries to benefit specific groups, thus enhancing the advantages for the party in control of the redistricting process. This could undermine the democratic principle of fair representation.