Republicans Running Scared As Democrats Introduce Bill To End Gerrymandering

[SCantiGOP]

60. not exactly, former9thward

There is no set percentage, certainly not as high as 70%. See this recent article on a challenge to Alabama using that argument:

At the crux of the dispute, in Alabama Legislative Black Caucus v. Alabama, is the question of whether the Voting Rights Act requires minority controlled districts to have a fixed percentage of minorities. Alabama argued at the Supreme Court that it believed that the Voting Rights Act mandated that if a district had been 70 percent African American before redistricting, it needed to be 70 percent African American after redistricting — even if that meant mapdrawers had to go out of their way to find African-American voters to add to the district in order to simultaneously satisfy the legal requirement that districts have equal populations.
In the case of Alabama’s maps, this interpretation resulted in radical changes to the boundaries of a number of districts where African Americans had successfully elected candidates for years. In one extreme example, mapdrawers needed to add nearly 16,000 people to an African-American majority senate district in central Alabama to make the district the same size as others. While there were a number of white voters in the area who could have been added to the district without requiring significant boundary changes or impacting African-American electoral effectiveness, mapdrawers chose instead to completely redraw the district to add 15,549 African Americans and, remarkably, only 36 whites.
https://www.brennancenter.org/blog/supreme-court-rejects-mechanical-interpretation-voting-rights-act

This is a purposeful misinterpretation of the law that the GOP has used to pack minority voters into districts so the 3 or 4 surrounding districts become reliably Republican.