This is not to say, of course, that § 5 legislation requires termination dates, geographic restrictions, or egregious predicates. Where, however, a congressional enactment pervasively prohibits constitutional state action in an effort to remedy or to prevent unconstitutional state action, limitations of this kind tend to ensure Congress means are proportionate to ends legitimate under § 5.
City of Boerne, 521 U.S. at 533.
Here again, it is enough that we perceive a basis upon which Congress might predicate a judgment that the application of New Yorks English literacy requirement to deny the right to vote to a person with a sixth grade education in Puerto Rican schools in which the language of instruction was other than English constituted an invidious discrimination in violation of the Equal Protection Clause.
See id. at 656.