For the truth of the Democrat's violent, murderous, suppression of blacks--post civil war: Chapter 31. The Deconstruction of Reconstruction. Ku Kluxers and the War against Civil Rights, 1866-1876.
Max Boot's "Invisible Armies" Liveright Publishing corp.
Deniers, such as Denmark below, are propagandists & liars, practicing the old time progressive's tactic--Tell the big lie, and tell it again, repeat, repeat, repeat...
It was the Republican party that succeeded in passing the 1965 Civil Rights laws also, with a vast number of Democrats voting and lobbying against them.