The 1870 census shows a large decline in the male to female ratio in seceding States...females outnumber males by a large margin. Whereas the 1860 census showed a strong male population prior to the war...the opposite occurs after the war.

http://www.dailymail.co.uk/news/article-2521611/Striking-antique-map-shows-Confederate-Civil-War-losses-mad-dash-American-West-1870s-South-super-populated-women.html