Cite as: 585 U. S. ____ (2018)
3
Opinion of the Court
complicated in Texas in 2011. Not only was the Legislature required to draw districts that were substantially
equal in population, see Perry, supra, at 391–392; Reynolds v. Sims, 377 U. S. 533 (1964); Wesberry v. Sanders,
376 U. S. 1 (1964), and to comply with special state-law
districting rules,2 but federal law imposed complex and
delicately balanced requirements regarding the consideration of race.
Then, as now, federal law restricted the use of race in
making districting decisions. The Equal Protection Clause
forbids “racial gerrymandering,” that is, intentionally
assigning citizens to a district on the basis of race without
sufficient justification. Shaw v. Reno, 509 U. S. 630, 641
(1993). It also prohibits intentional “vote dilution”—
“invidiously . . . minimiz[ing] or cancel[ing] out the voting
potential of racial or ethnic minorities.” Mobile v. Bolden,
446 U. S. 55, 66–67 (1980) (plurality opinion).
While the Equal Protection Clause imposes these important restrictions, its application in the field of districting is complicated. For one thing, because a voter’s race
sometimes correlates closely with political party preference, see Cooper v. Harris, 581 U. S. ___, ___–___ (2017)
(slip op., at 19–20); Easley v. Cromartie, 532 U. S. 234, 243
(2001), it may be very difficult for a court to determine
whether a districting decision was based on race or party
preference. Here, the three-judge court found that the two
factors were virtually indistinguishable.3
At the same time that the Equal Protection Clause
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2 See, e.g., Tex. Const., Art. III, §25 (Senate), §26 (House).
3 The court found: “[I]t is difficult to differentiate an intent to affect
Democrats from an intent to affect minority voters. Making minorities
worse off will likely make Democrats worse off, and vice versa.” C. J. S.
Findings 467a (citation omitted). “This correlation is so strong that [an
expert] assessed whether districts were minority opportunity districts
by looking at Democratic results/wins (noting that in Texas, minority
candidates of choice means Democrats).” Ibid.