Census data analysis shows the South had a much higher mortality rate than the North in the US Civil War

A small team of social scientists at New York University-Abu Dhabi has conducted what they describe as a more accurate assessment of the number of soldiers killed in the U.S. Civil War. In their study published in the Proceedings of the National Academy of Sciences, the group used census data to more accurately count the war dead, and found that the South had a much higher mortality rate.