Editors. "Impeachment of Andrew Johnson". The Literary Encyclopedia. First published 01 March 2010; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=10965, accessed 25 April 2015.]
He was impeached for violating the Tenure of Office Act, which forbid him to dismiss a cabinet member without congressional approval. The Senate trial lasted 11 and a half weeks. On the major charges, the Senate voted 35-19 for conviction, one vote short of the 2/3s vote required for removal from office.
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