Sixty years have passed since I was a fourth-grader. In the primary schools, history is a subject that's submitted to a wide range of interpretation, so at that level, we used a text called
My Pennsylvania, a wide-ranging book which dwelt upon subjects from the Quaker founders, to Washington at Valley Forge, to "famous Pensylvanians". Thaddeus Stevens got an entire chapter --
in no small part because he was a major figure in the advocacy for free public education in the Commonwealth, the first state to do so outside of New England. And that was the only part of Stevens' life which was covered.
But despite the fact that there was a lot more to the man, Stevens got no further attention in the history curriculum offered during my Junior and Senor High School studies, So it was not until an undergraduate course while in college that I learned of Stevens' role in the abolitionist movement, which probably figured in the end of his first term in Congress (1849-1853, as a Whig), and his stridency as a Reconstructionist Republican when returned to Congress after 1858.
Stevens was one of a number of former Whigs who gravitated to the emerging Republican Party in the last years of the 1850's, Upon his return to the House of Representatives, he was quickly caught up in the festering polarization as his abolitionist beliefs intensified, and when Civil War broke out, was an early supporter of a high tariff, paper money and other features common to the emerging American industrial state.
At the war's end, with Abraham Lincoln gone and the South rendered powerless, Stevens became the single most prominent member of the radical Reconstruction movement. He was an unapologetic proponent of the land reform ("forty acres and a mule to each (male, of course) emancipated slave"), and as relations further deteriorated, spearheaded the unsuccessful effort to impeach Andrew Johnson in the winter of 1867-68. By this time, Stevens' health was failing, and he died (in Washington rather than his Lancaster home the following August.
https://en.wikipedia.org/wiki/Thaddeus_Stevens
If there's a point to all this, I believe that it's that the passions of a time of intense partisanship might mellow with the passing of the years, but the "revisionist" view sometimes hides under a unique veneer of its own making.