This Day in History: President <br />Andrew Johnson Is Impeached February 24, 1868 Johnson assumed the <br />presidency after Lincoln's assassination. <br />He became the first U.S. president to be impeached. 11 articles of impeachment <br />were approved by the House of Representatives. They arose from Johnson's <br />unpopular and racist post-Civil War <br />Reconstruction policies, and the firing of Lincoln <br />appointed secretary of war, Edwin Stanton. Johnson's Senate impeachment <br />trial began on March 13. He was not convicted, narrowly <br />escaping removal from office.