When was President Andrew Johnson impeached?

The House of Representatives impeached President Andrew Johnson on February 24, 1868 on eleven articles impeachment, the most important of which was several counts of violating the Tenure of Office Act.

Chief Justice Salmon P. Chase presided over the Senate trial that began on March 5, 1868. On May 16, 1868, the Senate made three attempts to vote Johnson out of office, but failed 35-19 - just one vote short of conviction - each time. Johnson was acquitted and completed his term as President in 1869.