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A North Carolina court delivered a big win to Democrats overnight, ruling the state’s legislative district map unconstitutional. The decision paves a path to undo years of Republican gerrymandering in one of the nation’s most bitterly divided states.

The court is leaving it up to the Republican state legislature to redraw the maps, but it is setting specific guidelines for them to follow, including that the new maps must be redrawn within two weeks and that lawmakers can’t use data to try to draw a partisan advantage.

The ruling by a three-judge panel has the potential to bring to a decisive end a years-long battle over gerrymandering in a critical swing state.

United States Studies Centre CEO Professor Simon Jackman has provided expert testimony in previous legal challenges to North Carolina's congressional redistricting. You can read his explainer on gerrymandering here