Old School Data Visualization: cloropleth, slavery

RantWoman reprints this tweet here with hope of easily finding it again should she want to.

	E. Ariño de la Rubia @earino
155 year old cloropleth map of percentage of slaves by U.S. county in 1860 #dataviz #oldschool pic.twitter.com/JJYr5exJcO 2:26 PM - 25 Jul 2015