The Supreme Court has struck down Louisiana’s second majority Black congressional district in a decision that could open the door for Republican-led states to eliminate Black and Latino electoral districts that tend to favor Democrats. The court’s conservative majority Wednesday found a district represented by Democrat Cleo Fields relied too heavily on race. The decision weakens a landmark voting rights law’s protections against discrimination in redistricting. It’s unclear how much is left of the Section 2 provision, the main way to challenge racially discriminatory election practices. The 1965 voting rights law was the centerpiece legislation of the Civil Rights Movement and succeeded in opening the ballot box to Black Americans.