Mr. Justice Stewart
delivered the opinion of the Court.
Section 5 of the Voting Rights Act of 1965 1 prohibits [132]*132a State or political subdivision subject to § 4 of the Act2 from enforcing “any voting qualification or prerequisite to voting, or standard, practice, or procedure with re[133]*133spect to voting different from that in force or effect on November 1, 1964,” unless it has obtained a declaratory-judgment from the District Court for the District of Columbia that such change “does not have the purpose and will not have the effect of denying or abridging the right to vote on account of race or color” or has submitted the proposed change to the Attorney General and the Attorney General has not objected to it. The constitutionality of this procedure was upheld in South Carolina v. Katzenbach, 383 U. S. 301, and it is now well established that § 5 is applicable when a State or political subdivision adopts a legislative reapportionment plan. Allen v. State Board of Elections, 393 U. S. 544; Georgia v. United States, 411 U. S. 526.
The city of New Orleans brought this suit under § 5 seeking a judgment declaring that a reapportionment of New Orleans’ councilmanic districts did not have the purpose or effect of denying or abridging the right to vote on account of race or color.3 The District Court [134]*134entered a judgment of dismissal, holding that the new reapportionment plan would have the effect of abridging the voting rights of New Orleans’ Negro citizens. 374 F. Supp. 363. The city appealed the judgment to this Court, claiming that the District Court used an incorrect standard in assessing the effect of the reapportionment in this § 5 suit. We noted probable jurisdiction of the appeal. 419 U. S. 822.
I
New Orleans is a city of almost 600,000 people. Some 55% of that population is white and the remaining 45% is Negro. Some 65% of the registered voters are white, and the remaining 35% are Negro.4 In 1954, New Orleans adopted a mayor-council form of government. Since that time the municipal charter has provided that the city council is to consist of seven members, one to be elected from each of five councilmanic districts, and two to be elected by the voters of the city at large. The 1954 charter also requires an adjustment of the boundaries of the five single-member councilmanic districts following each decennial census to reflect population shifts among the districts.
[135]*135In 1961, the city council redistricted the city based on the 1960 census figures. That reapportionment plan established four districts that stretched from the edge of Lake Pontchartrain on the north side of the city to the Mississippi River on the city’s south side. The fifth district was wedge shaped and encompassed the city’s downtown area. In one of these councilmanic districts, Negroes constituted a majority’ of the population, but only about half of the registered voters. In the other four districts white voters clearly outnumbered Negro voters. No Negro was elected to the New Orleans City Council during the decade from 1960 to 1970.
After receipt of the 1970 census figures the city council adopted a reapportionment plan (Plan I) that continued the basic north-to-south pattern of councilmanic districts combined with a wedge-shaped, downtown district. Under Plan I Negroes constituted a majority of the population in two districts, but they did not make up a majority of registered voters in any district. The largest percentage of Negro voters in a single district under Plan I was 45.2%. When the city submitted Plan I to the Attorney General pursuant to § 5, he objected to it, stating that it appeared to “dilute black voting strength by combining a number of black voters with a larger number of white voters in each of the five districts.” He also expressed the view that “the district lines [were not] drawn as they [were] because of any compelling governmental need” and that the district lines did “not reflect numeric population configurations or considerations of district compactness or regularity of shape.”
Even before the Attorney General objected to Plan I, the city authorities had commenced work on a second plan — Plan II.5 That plan followed the general north-[136]*136to-south districting pattern common to the 1961 apportionment and Plan I.6 It produced Negro population majorities in two districts and a Negro voter majority (52.6%) in one district. When Plan II was submitted to the Attorney General, he posed the same objections to it that he had raised to Plan I. In addition, he noted that “the predominantly black neighborhoods in the city are located generally in an east to west progression,” and pointed out that the use of north-to-south districts in such a situation almost inevitably would have the effect of diluting the maximum potential impact of the Negro vote. Following the rejection by the Attorney General of Plan II, the city brought this declaratory judgment action in the United States District Court for the District of Columbia.
The District Court concluded that Plan II would have the effect of abridging the right to vote on account of race or color.7 It calculated that if Negroes could elect city councilmen in proportion to their share of the city’s registered voters, they would be able to choose 2.42 of the city’s seven councilmen, and, if in proportion to their share of the city’s population, to choose 3.15 councilmen.8 But under Plan II the District Court concluded [137]*137that, since New Orleans’ elections had been marked by bloc voting along racial lines, Negroes would probably be able to elect only one councilman — the candidate from the one councilmanic district in which a majority of the voters were Negroes. This difference between mathematical potential and predicted, reality was such that “the burden in the case at bar was at least to demonstrate that nothing but the redistricting proposed by Plan II was feasible.” 374 F. Supp., at 393. The court concluded that “[t]he City has not made that sort of demonstration; indeed, it was conceded at trial that neither that plan nor any of its variations was the City’s sole available alternative.” Ibid.9
As a separate and independent ground for rejecting Plan II, the District Court held that the failure of the plan to alter the city charter provision establishing two at-large seats had the effect in itself of “abridging the right to vote ... on account of race or color.” As the court put it: “[T]he City has not supported the choice of at-large elections by any consideration which would sat[138]*138isfy the standard of compelling governmental interest, or the need to demonstrate the improbability of its realization through the use of single-member districts.
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Mr. Justice Stewart
delivered the opinion of the Court.
Section 5 of the Voting Rights Act of 1965 1 prohibits [132]*132a State or political subdivision subject to § 4 of the Act2 from enforcing “any voting qualification or prerequisite to voting, or standard, practice, or procedure with re[133]*133spect to voting different from that in force or effect on November 1, 1964,” unless it has obtained a declaratory-judgment from the District Court for the District of Columbia that such change “does not have the purpose and will not have the effect of denying or abridging the right to vote on account of race or color” or has submitted the proposed change to the Attorney General and the Attorney General has not objected to it. The constitutionality of this procedure was upheld in South Carolina v. Katzenbach, 383 U. S. 301, and it is now well established that § 5 is applicable when a State or political subdivision adopts a legislative reapportionment plan. Allen v. State Board of Elections, 393 U. S. 544; Georgia v. United States, 411 U. S. 526.
The city of New Orleans brought this suit under § 5 seeking a judgment declaring that a reapportionment of New Orleans’ councilmanic districts did not have the purpose or effect of denying or abridging the right to vote on account of race or color.3 The District Court [134]*134entered a judgment of dismissal, holding that the new reapportionment plan would have the effect of abridging the voting rights of New Orleans’ Negro citizens. 374 F. Supp. 363. The city appealed the judgment to this Court, claiming that the District Court used an incorrect standard in assessing the effect of the reapportionment in this § 5 suit. We noted probable jurisdiction of the appeal. 419 U. S. 822.
I
New Orleans is a city of almost 600,000 people. Some 55% of that population is white and the remaining 45% is Negro. Some 65% of the registered voters are white, and the remaining 35% are Negro.4 In 1954, New Orleans adopted a mayor-council form of government. Since that time the municipal charter has provided that the city council is to consist of seven members, one to be elected from each of five councilmanic districts, and two to be elected by the voters of the city at large. The 1954 charter also requires an adjustment of the boundaries of the five single-member councilmanic districts following each decennial census to reflect population shifts among the districts.
[135]*135In 1961, the city council redistricted the city based on the 1960 census figures. That reapportionment plan established four districts that stretched from the edge of Lake Pontchartrain on the north side of the city to the Mississippi River on the city’s south side. The fifth district was wedge shaped and encompassed the city’s downtown area. In one of these councilmanic districts, Negroes constituted a majority’ of the population, but only about half of the registered voters. In the other four districts white voters clearly outnumbered Negro voters. No Negro was elected to the New Orleans City Council during the decade from 1960 to 1970.
After receipt of the 1970 census figures the city council adopted a reapportionment plan (Plan I) that continued the basic north-to-south pattern of councilmanic districts combined with a wedge-shaped, downtown district. Under Plan I Negroes constituted a majority of the population in two districts, but they did not make up a majority of registered voters in any district. The largest percentage of Negro voters in a single district under Plan I was 45.2%. When the city submitted Plan I to the Attorney General pursuant to § 5, he objected to it, stating that it appeared to “dilute black voting strength by combining a number of black voters with a larger number of white voters in each of the five districts.” He also expressed the view that “the district lines [were not] drawn as they [were] because of any compelling governmental need” and that the district lines did “not reflect numeric population configurations or considerations of district compactness or regularity of shape.”
Even before the Attorney General objected to Plan I, the city authorities had commenced work on a second plan — Plan II.5 That plan followed the general north-[136]*136to-south districting pattern common to the 1961 apportionment and Plan I.6 It produced Negro population majorities in two districts and a Negro voter majority (52.6%) in one district. When Plan II was submitted to the Attorney General, he posed the same objections to it that he had raised to Plan I. In addition, he noted that “the predominantly black neighborhoods in the city are located generally in an east to west progression,” and pointed out that the use of north-to-south districts in such a situation almost inevitably would have the effect of diluting the maximum potential impact of the Negro vote. Following the rejection by the Attorney General of Plan II, the city brought this declaratory judgment action in the United States District Court for the District of Columbia.
The District Court concluded that Plan II would have the effect of abridging the right to vote on account of race or color.7 It calculated that if Negroes could elect city councilmen in proportion to their share of the city’s registered voters, they would be able to choose 2.42 of the city’s seven councilmen, and, if in proportion to their share of the city’s population, to choose 3.15 councilmen.8 But under Plan II the District Court concluded [137]*137that, since New Orleans’ elections had been marked by bloc voting along racial lines, Negroes would probably be able to elect only one councilman — the candidate from the one councilmanic district in which a majority of the voters were Negroes. This difference between mathematical potential and predicted, reality was such that “the burden in the case at bar was at least to demonstrate that nothing but the redistricting proposed by Plan II was feasible.” 374 F. Supp., at 393. The court concluded that “[t]he City has not made that sort of demonstration; indeed, it was conceded at trial that neither that plan nor any of its variations was the City’s sole available alternative.” Ibid.9
As a separate and independent ground for rejecting Plan II, the District Court held that the failure of the plan to alter the city charter provision establishing two at-large seats had the effect in itself of “abridging the right to vote ... on account of race or color.” As the court put it: “[T]he City has not supported the choice of at-large elections by any consideration which would sat[138]*138isfy the standard of compelling governmental interest, or the need to demonstrate the improbability of its realization through the use of single-member districts. These evaluations compel the conclusion that the feature of the city’s electoral scheme by which two councilmen are selected at large has the effect of impermissibly minimizing the vote of its black citizens; and the further conclusion that for this additional reason the city’s redistricting plan does not pass muster.” Id., at 402. (Footnotes omitted.)
The District Court therefore refused to allow Plan II to go into effect. As a result there have been no coun-cilmanic elections in New Orleans since 1970, and the councilmen elected at that time (or their appointed successors) have remained in office ever since.
II
A
The appellants urge, and the United States on reargument of this case has conceded, that the District Court was mistaken in holding that Plan II could be rejected under § 5 solely because it did not eliminate the two at-large councilmanic seats that had existed since 1954. The appellants and the United States are correct in their interpretation of the statute in this regard.
The language of § 5 clearly provides that it applies only to proposed changes in voting procedures. “[Discriminatory practices . . . instituted prior to November 1964 . . . are not subject to the requirement of pre-clearance [under § 5].” U. S. Commission on Civil Rights, The Voting Rights Act: Ten Years After, p. 347. The ordinance that adopted Plan II made no reference to the at-large councilmanic seats. Indeed, since those seats had been established in 1954 by the city charter, an ordinance could not have altered them; any change in [139]*139the charter would have required approval by the city’s voters. The at-large seats, having existed without change since 1954, were not subject to review in this proceeding under § 5.10
B
The principal argument made by the appellants in this Court is that the District Court erred in concluding that the makeup of the five geographic council-manic districts under Plan II would have the effect of abridging voting rights on account of race or color. In evaluating this claim it is important to note at the outset that the question is not one of constitutional law, but of statutory construction.11 A determination of when a legislative reapportionment has “the effect of denying or abridging the right to vote on account of race or color,” must depend, therefore, upon the intent of [140]*140Congress in enacting the Voting Rights Act and specifically § 5.
The legislative history reveals that the basic purpose of Congress in enacting the Voting Rights Act was “to rid the country of racial discrimination in voting.” South Carolina v. Katzenbach, 383 U. S., at 315. Section 5 was intended to play an important role in achieving that goal:
“Section 5 was a response to a common practice in some jurisdictions of staying one step ahead of the federal courts by passing new discriminatory voting laws as soon as the old ones had'been struck down. That practice had been possible because each new law remained in effect until the Justice Department or private plaintiffs were able to sustain the burden of proving that the new law, too, was discriminatory. . . . Congress therefore decided, as the Supreme Court held it could, ‘to shift the advantage of time and inertia from the perpetrators of the evil to its victim/ by ‘freezing election procedures in the covered areas unless the changes can be shown to be nondiscriminatory.’ ” H. R. Rep. No. 94-196, pp. 57-58. (Footnotes omitted.)
See also H. R. Rep. No. 439, 89th Cong., 1st Sess., 9-11, 26; S. Rep. No. 162, 89th Cong., 1st Sess., pt. 3, pp. 6-9, 24; H. R. Rep. No. 91-397, pp. 6-8; H. R. Rep. No. 94-196, pp. 8-11, 57-60; S. Rep. No. 94-295, pp. 15-19; South Carolina v. Katzenbach, supra, at 335.
By prohibiting the enforcement of a voting-procedure change until it has been demonstrated to the United States Department of Justice or to a three-judge federal court that the change does not have a discriminatory effect, Congress desired to prevent States from “undo-ting] or defeat [ing] the rights recently won” by Negroes. H. R. Rep. No. 91-397, p. 8. Section 5 was intended [141]*141“to insure that [the gains thus far achieved in minority political participation] shall not be destroyed through new [discriminatory] procedures and techniques.” S. Rep. No. 94-295, p. 19.
When it adopted a 7-year extension of the Voting Rights Act in 1975, Congress explicitly stated that “the standard [under § 5] can only be fully satisfied by determining on the basis of the facts found by the Attorney General [or the District Court] to be true whether the ability of minority groups to participate in the political process and to elect their choices to office is augmented, diminished, or not affected by the change affecting voting . . . .” H. R. Rep. No. 94-196, p. 60 (emphasis added) ,12 In other words the purpose of § 5 has always been to insure that no voting-procedure changes would be made that would lead to a retrogression in the position of racial minorities with respect to their effective exercise of the electoral franchise.
It is thus apparent that a legislative reapportionment that enhances the position of racial minorities with respect to their effective exercise of the electoral franchise can hardly have the “effect” of diluting or abridging the right to vote on account of race within the meaning of § 5. We conclude, therefore, that such an ameliorative new legislative apportionment cannot violate § 5 unless the new apportionment itself so discriminates on the basis of race or color as to violate the Constitution.
The application of this standard to the facts of the present case is straightforward. Under the apportionment of 1961 none of the five councilmanic districts had a clear Negro majority of registered voters, and no Negro [142]*142has been elected to the New Orleans City Council while that apportionment system has been in effect. Under Plan II, by contrast, Negroes will constitute a majority of the population in two of the five districts and a clear majority of the registered voters in one of them. Thus, there is every reason to predict, upon the District Court’s hypothesis of bloc voting, that at least one and perhaps two Negroes may well be elected to the council under Plan II.13 It was therefore error for the District Court to conclude that Plan II “will. . . have the effect of denying or abridging the right to vote on account of race or color” within the meaning of § 5 of the Voting Rights Act.14
[143]*143Accordingly, the judgment of the District Court is vacated, and the case is remanded to that court for further proceedings consistent with this opinion.
It is so ordered.
Mr. Justice Stevens took no part in the consideration or decision of this case.