President Lincoln issues his preliminary Emancipation Proclamation,
declaring that on Jan 1, 1863, slaves in areas still in rebellion
would be declared free.
Citation:
Editors. "Preliminary Emancipation Proclamation issued".
The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=10942, accessed 24 May 2013.]