Washington — The Supreme Court on Wednesday struck down Louisiana's congressional map that includes two majority-Black districts, delivering a significant victory for Republicans in a major decision that narrows the landmark Voting Rights Act. The high court upheld a lower court ruling that found Louisiana mapmakers relied too heavily on race when they redrew the state's voting boundaries to comply with Section 2 of the Voting Rights Act. In a 6-3 decision authored by Justice Samuel Alito, the Supreme Court's conservative majority found that compliance with Section 2 could not justify the state's use of race in redrawing its House district lines. "Because the Voting Rights Act did not require Louisiana to create an additional majority-minority district, no compelling interest justified the state's use of race in creating SB8," Alito wrote, referring to the map.…