On February 24, 1868, the House of Representatives voted impeachment to President Andrew Johnson on vote of 126-47. There were eleven articles of impeachment proving his “high crimes and misdemeanors”.
The reason the Radical Republicans wanted to impeach President Andrew Johnson was because in February, 1868, he removed Secretary of War Edwin M. Stanton, an ally of the Radicals, and replaced him with John McAllister Schofield. This action violated the Tenure of Office Act, which was adopted by Congress in March 1867.
On March 2, the House agreed to the articles of impeachment to him. On May 16, 1868, Andrew Johnson was acquitted on the removal trial by one vote short (35-19) of the two-thirds necessary to remove him. Johnson completed his Presidential term and left office in March, 1869.