Cite as: 602 U. S. ____ (2024)
5
THOMAS, J., concurring in part
omitted).
Divining legislative purpose is a dubious undertaking in
the best of circumstances, but the task is all but impossible
in gerrymandering cases. “Electoral districting is a most
difficult subject for legislatures,” a pure “exercise [of] the
political judgment necessary to balance competing interests.” Miller, 515 U. S., at 915. We have therefore cautioned courts to “be sensitive to the complex interplay of
forces that enter a legislature’s redistricting calculus.” Id.,
at 915–916.
In cases without smoking-gun evidence, the only practical way to prove that a State considered race when drawing
districts is to “show that the State’s chosen map conflicts
with traditional redistricting criteria.” 1 Ante, at 3. The
Court’s racial gerrymandering precedents use the term
“ ‘traditional districting principles’ ” to refer to the “competing interests” and “complex . . . forces” involved in drawing
districts. Miller, 515 U. S., at 915–916, 919 (quoting Shaw,
509 U. S., at 647). Judging a map’s consistency or conflict
with traditional districting principles requires a court to ascertain what kinds of maps should result from the application of those principles.
Determining how a legislature would have drawn district
lines in a vacuum is a fool’s errand. Indeed, as we have
defined them, “traditional districting principles” are simply
anything relevant to drawing districts other than race.
They include “principles such as compactness, contiguity,
and respect for political subdivisions.” Id., at 647. They
also include “keeping communities of interest together, and
protecting incumbents,” Rucho, 588 U. S., at 706–707, as
well as “minimizing change,” Alabama Legislative Black
Caucus v. Alabama, 575 U. S. 254, 259 (2015). Today, the
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1 As the Court observes, the most common direct evidence that a State
considered race in drawing a districting plan is the State’s admission
that it considered race in order to comply with our Voting Rights Act
precedents. Ante, at 3.