All nine justices agreed that one of the two seats in question — North Carolina's 1st Congressional District — was created based on impermissible racial criteria. The reason that even the dissenting justices concurred in this part of the decision is that state legislative leaders made the mistake of openly saying they were deliberately creating this district as a 51 percent black-majority district in order to get preclearance from the Obama administration's Justice Department.
So this is the point of greatest agreement: All nine justices were on the same page that the easiest way to violate Section Two of the Voting Rights Act is to try very hard to follow it. (The 1st District, by the way, is not especially weird-shaped, drawn almost entirely along county lines.)
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