In Evenwel v. Abbott (2016), the Supreme Court did not mandate using either total population or eligible voters for redistricting.
In the case of Evenwel v. Abbott (2016), the Supreme Court of the United States did not specifically mandate the use of either total population or total eligible voters for the purpose of drawing legislative districts. The central issue in this case was whether states could use total population or were required to use eligible voter population when redistricting.
The plaintiffs argued for a "one-person, one-vote" principle based on the total number of eligible voters, claiming that using total population dilutes the voting power of eligible voters. The Court, in a unanimous decision, held that states have the flexibility to use either total population or another standard based on eligible voters.
The ruling did not impose a strict requirement on states to choose one method over the other, allowing them to make such determinations within constitutional limits.