On 10 February, the 25th Amendment was ratified by the U.S. Congress. The amendment provided for presidential succession.
Citation:
Richert, Lucas Paul. "25th Amendment ratified".
The Literary Encyclopedia. First published 01 November 2008
[http://www.litencyc.com/php/stopics.php?rec=true&UID=5671, accessed 21 May 2013.]