The Supreme Court on Monday agreed to hear an appeal over Louisiana’s more Democratic-friendly congressional districts, though the case won’t impact this year’s election.

Noting the size of the state’s Black population, civil rights advocates challenged the map in a Baton Rouge-based federal court and won a ruling from U.S. District Judge Shelly Dick that the districts likely discriminated against Black voters.

The Supreme Court on Monday agreed to hear a complex dispute over how Louisiana draws congressional maps that could affect the power of Black voters in the state and the balance of power in Congress. The case will not impact Tuesday’s election since it ...