Just because you view all history as the result of a "secret cabal of evildoers" (in this case, plotting to preserve slavery) doesn't mean I have to.
As you let slip here, Horne's writings aren't about history: they're a form public of agitation so that "the USA will do less racist shit". Which would be fine if he was a social critic or a politician. But he's been passing himself off as a historian.
Words have meanings. "Propaganda" isn't just funny stories; it is done for particular interests. You claim he's a propagandist, so you should identify which interests those are. Failing that, you could retract your vicious slur...
