The political idealism of the Revolution also encouraged, and sometimes forced, white slave owners to liberate their slaves. - Allen C. Guelzo

Technically, Reconstruction was "over" when the last of the Confederate states had written new state constitutions and elected representatives and senators in conformity with the Reconstruction Acts. This happened fairly quickly, between June 1868 and July 1870, and it put in place state governments that were largely dominated by Republicans and that made heroic efforts to make a reality of voting rights for the freed slaves. But one by one, the wheels came off these reconstructed state governments and the old Southern Democratic power machines regained control. But “regained” is too anodyne; “overthrew” is the real word, since the recapture of these state governments was accomplished by violence and black voter intimidation.

Trying to plant such an oligarchy in the midst of what was otherwise the world's most successful republican regime was no small task, and it required the invention of ideological monstrosities to justify it. In the Southern case, the monstrosities included race-based rationales for the enslavement of Africans.

In 1863, the United States is really the only free-standing democracy in the world. That all across the stage of world history the forces of reaction have been on the march, ever since Napoleon Bonaparte.