Summary: Controversial radical, but an important figure both in political and legislative history, and in the history of emancipation and reconstruction.
Many important people are less well-known than they should be. Thaddeus Stevens is one of them. I think the way that many people to do know who he is and have heard of him is because Tommy Lee Jones played him in the movie Lincoln.
Hans Trefousse’s 2005 biography was the first real reevaluation of Stevens in a couple of generations. (Bruce Levine has a new biography published in 2021 that I have not read.) I picked this up on sale at Audible, which may not have been the best format.
One of the problems with the biography of Stevens is that he is a lawyer and legislator. He was known for being effective with parliamentary rules and procedures. And rules and procedures are not scintillating reading. But they are essential to the work of legislating.
Thaddeus Stevens is best known for leading the House during the Civil War and being the leader of what is commonly known as the Radical Republicans during the Reconstruction Era. He strongly favored public education, emancipation before the Civil War, and civil and voting rights after the Civil War. Radical Republicans were both organized to oppose Johnson and to push for stronger federal actions to protect Black citizens across the country and to punish former Confederate officials more strongly.
Stevens believed former Confederates were not US citizens (and therefore not subject to the bill of rights and other protections) but fell under international rules of war as a conquered territory and should be handled with military law, not civil law. This means that he did not think that the legislature should seat anyone from those territories until there were new votes by the legislature to adopt them as states. (Incidentally, Johnson was a senator from Tennessee that remained with the Union and continued to be seated in the Senate after Tennessee joined the Confederacy until Lincoln appointed him as military governor in 1862 before he was elected Vice president. So under Stevens’ understanding, Johnson should have been removed from the Senate when Tennesse withdrew from the Union.) The implication of Stevens’ understanding of citizenship means that the legislature would have been a smaller body with only Northern legislators, which would have changed the requirements for approving legislation, passing the constitutional amendments, vetoes, and impeachment.