Andrew Johnson had a long political career, as an alderman, mayor, Tennessee house member; governor, U.S. Senator, Vice-President, President, and finally Senator again.
When President Lincoln ran for re-election in 1864, he dropped Vice-President Hannibal Hamlin, as well as the Republican label, and instead headed a new “National Union Party” with Johnson as his Vice President.
Why did Abe pick a Southern Democrat who had owned slaves until he was forced to release them under the Emancipation Proclamation? Lincoln tagged him because: 1) he fought to preserve the Union; 2) he did not oppose the 13th Amendment to abolish slavery; and 3) he could help carry the Border States in the 1864 election.
Johnson had in fact been the only Southern Senator to vote against secession. After he called his former friends and neighbors traitors, he himself was branded a turncoat. As the Tennessee militia set out to arrest him, he narrowly escaped on horseback.
Greenville, Tennessee, where Johnson lived, changed hands 27 times during the Civil War. With Andrew gone, the rebels ransacked his home and left threatening messages on his walls. His wife Eliza was detained for two days before she was released. Johnson’s son Charles, who enlisted as a doctor in the Union Army, would die in uniform in 1863.
So why was the loyal Johnson targeted for impeachment? Even though it was Abe who dumped Republican Hamlin to make way for a Southerner, Johnson took the blame. The basic problem was Johnson was a States Rights Democrat. and as such, he was isolated, because his fellow Southern Congressmen had not yet been re-seated.
Johnson was not against all things Republican. For example, he supported the Office of Education, as he understood the value of learning. Since he had never been to school, his wife had to teach him how to write. The fundamental disagreement was over the use of federal legislation to override state measures endorsed by the Ku Klux Klan.
When white supremacists created “Black Codes” in 1865 to perpetuate unequal treatment for blacks in the state courts, Congress passed a bill to supersede them, but Johnson vetoed it. When Congress tried again to guarantee equal treatment under the Civil Rights Act of 1866, Johnson again vetoed, but this time he was overridden.
As the Klan continued interfering with the voting rights of former slaves, Congress passed a Reconstruction Bill (1867) directing the armed forces to register all black voters, but Johnson vetoed it, as he believed the states should decide such questions. As the Republicans overrode yet another veto, the U.S. Army proceeded to register black voters.
Many former Confederates demanded that Johnson remove Sec. of War Edwin Stanton over what U.S. troops were doing. Anticipating a discharge of Stanton, Congress passed the Tenure in Office Act (1867), which barred the Commander-in-Chief from firing any military commander without Senate approval.
The President vetoed the Tenure Act, as he viewed it as unconstitutional, saying he felt it infringed on his executive powers. After his veto was overridden, Johnson went ahead and fired Stanton anyway, but the Sec. of War stubbornly refused to vacate his post.
Johnson was impeached over his alleged violation of the Tenure Act and his belief that Congress could not lawfully pass any bill, unless the former rebels were first reseated. The hysteria ran so high, some alleged Johnson conspired to kill Lincoln. Many forgot that Andrew was also targeted by the assassins and the only reason he lived was that the man who was to shoot him lost his nerve.
After the House voted 128 to 47 to impeach (accuse) Johnson, the case moved into the Senate, where a two-month trial (with live witnesses) was held from March through June 1868. Thanks to two Senators from Iowa and Kansas, who changed their minds late in the proceedings, Johnson was acquitted by just one vote.
After Johnson’s “not guilty” verdict, Congress shunned him and he spent his final ten months as a “lame duck.” The President did however get back at the Republicans, as he granted amnesty to Jefferson Davis and pardoned all Southerners who fought in the Civil War. Once again popular in Tennessee, Johnson was returned to the U.S. Senate in 1874.