Editors. "David Wilmot proposes slavery ban in territory acquired from Mexico". The Literary Encyclopedia. First published 30 December 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=18104, accessed 19 June 2013.]
American Congressman David Wilmot proposals that slavery should be disallowed in any territory acquired from Mexico. This proviso passes the House of Representatives but fails to pass the Senate through opposition of Southern senators.