Your right, tribalism isn't unique to blacks, nor is it to democrats. At a very fundamental level all humans are tribal. That is how we survived on the plains of Africa, in the forests of Europe, across the islands of Oceana. Tribalism provides safety from "the other" and a means of exploiting the environment for food and shelter. Tribes can be constructive or destructive. The Amish, North Dakotans, graduates of a particular school, on the other hand are the Bloods, Crips and muslims.
As trouble percolates around us and increases in scope and intensity, that tribalism will always reassert itself. The "Band of Brothers" that was Easy Company moving inland after D-Day. Block watches. The rest of the guys down at the loading dock. Your shipmates. We invest our trust in those we find trustworthy.
Tribes take many shapes; your immediate and extended family, your church mates, those on your block or neighborhood. Members gain acceptance and protection by helping to protect others of the tribe.
The 'other' goes from annoying to scary...