Wow. Trump really did cut into their base. Normal black support for Democrat candidates is around 95%. Trump increased black support of Republicans by 5%.
This article is very misleading. 90% is a REDUCTION of their previous support level.
The 90 % number is misleading and counts only in a presidential race.
For house races, many districts are gerrymandered to capture the majority black vote. In urban disrticts black voters predominate beyond the 90% level.