It’s not surprising to anyone who has lived in or visited a major American metropolitan region that the nation’s cities tend to be organized in their own particular racial pattern. In Chicago, it’s a north/south divide. In Austin, it’s west/east. In some cities, it’s a division based around infrastructure, as with Detroit’s 8 Mile Road. In other cities, nature—such as Washington, D.C.’s Anacostia River—is the barrier. Sometimes these divisions are man-made, sometimes natural, but none are coincidental.