Control of Congressional Redistricting as of 2018 elections

[Florida Man for Crime]

Maybe the Republican SCOTUS majority will just vote down Democratic gerrymanders and not bother with setting precedents.

Roberts and Kavanaugh will rule that it is OK for Republicans to gerrymander, but not OK for Democrats to gerrymander.

[Florida Man for Crime]

Yes, a 40% black district would elect a democrat. But would a black democrat get through the primary? Probably not.

That is highly likely. If you didn't notice, Black Democrats just got elected in quite a few seats with much, much smaller African American populations such as NY-19, GA-06, IL-14, TX-32, and CO-02.

So yes, a Black Democrat would have a great chance at winning a Democratic primary. That doesn't mean a Black Democrat would be guaranteed to win, but that is never the case. Ask Bill Jefferson of Louisiana. If they didn't win, it would almost certainly be because there was something wrong with their candidacy, not solely because they are black.