Cite as: 515 U. S. 900 (1995)
Opinion of the Court
judiciary is supreme in the exposition of the law of the Constitution").
For the same reasons, we think it inappropriate for a court engaged in constitutional scrutiny to accord deference to the Justice Department's interpretation of the Act. Although we have deferred to the Department's interpretation in certain statutory cases, see, e. g., Presley v. Etowah County Comm'n, 502 U. S. 491, 508-509 (1992), and cases cited therein, we have rejected agency interpretations to which we would otherwise defer where they raise serious constitutional questions. Edward J. DeBartolo Corp. v. Florida Gulf Coast Building & Constr. Trades Council, 485 U. S. 568, 574-575 (1988). When the Justice Department's interpretation of the Act compels race-based districting, it by definition raises a serious constitutional question, see, e. g., Bakke, 438 U. S., at 291 (opinion of Powell, J.) ("Racial and ethnic distinctions of any sort are inherently supect" under the Equal Protection Clause), and should not receive deference.
Georgia's drawing of the Eleventh District was not required under the Act because there was no reasonable basis to believe that Georgia's earlier enacted plans violated § 5. Wherever a plan is "ameliorative," a term we have used to describe plans increasing the number of majority-minority districts, it "cannot violate § 5 unless the new apportionment itself so discriminates on the basis of race or color as to violate the Constitution." Beer, 425 U. S., at 141. Georgia's first and second proposed plans increased the number of majority-black districts from 1 out of 10 (10%) to 2 out of 11 (18.18%). These plans were "ameliorative" and could not have violated § 5's nonretrogression principle. Ibid. Acknowledging as much, see Brief for United States 29; 864 F. Supp., at 1384-1385, the United States now relies on the fact that the Justice Department may object to a state proposal either on the ground that it has a prohibited purpose or a prohibited effect, see, e. g., Pleasant Grove v. United
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