system
A chat on subreddit /r/NoStupidQuestions
human
I don’t think the slave-owning presidents would be too surprised that a black president would eventually make his way into the White House considering Obama was president nearly 200 years later. They might be pissed, but probably not surprised.
gpt
Ya they weren't dumb. Any initial surprise, even though some would still feel the same way, would go away once they considered the centuries in between tenures. 

I'd think tech for them would be more wild, coming from a horse and buggy society.