the cilvil war? I could only find this one pamphlet written in 1884, but it doesn't say what/when states adopted a formal policy of converting their former slaves.
http://docsouth.unc.edu/church/jones/jones.html
Sorry...1842 it was proposed to educate slaves on Christianity
http://docsouth.unc.edu/church/jones/jones.html
Sorry...1842 it was proposed to educate slaves on Christianity