An attempt to procedurally draw the amazing data visualization of African-American demographics in 1890 by W. E. B. Du Bois based on census data. Rural/Small Town/Suburban/Urban is just a threshold for pop density of less than 10, 10 to 100, 100 to 1000 and 1000 plus people per square mile from census land area of counties.
This version uses the second-most populous area (the top line) as the baseline for the scale to draw the spiral, emphasizing with the spiral the vast difference between where the majority of that group lives compared to where else that group resides.
Celebrate Black History