I thought I would look to see how well a district could be drawn in AL with whole counties that would elect a black candidate of choice. Technically the courts have interpreted the VRA to set a 50% threshold to qualify for relief, but have only said that the district should be able to elect the candidate of choice for the minority group. In IL the East St Louis state house district was just drawn with under 50% BVAP, even though a district over 50% could have been drawn.
I started with a whole county district within 0.5% of the ideal population as CD 2. The constraint of the southern population required a path along the eastern edge, which limited the district to 46.0% BVAP. White VAP is at 49.7%, and I suspect this district would elect the candidate of choice for the black minority.
To draw the rest of the map, I used whole counties except for a split of Jefferson, since I found that at least one county needed to be split to maintain districts within 0.5% of the ideal population. The split I used created a second opportunity for blacks in CD 7 which would be 43.6% BVAP.
I realize I'm a little late commenting on this, but this is a really tough sell. The district is R+1, with both Obama and Kerry underperforming their national average. What's more, in 2008, Jeff Sessions carried the district against an African-American challenger with an African-American on the top of the ticket. While it may be the best that one can do with whole counties, it's hardly a lock.