Of course it wasn't about slavery, it was about taxes!
Abraham Lincoln, alone, ordered the invasion of the States soley to collect an
average 40% federal sales tax (200% on plows and stoves used by pioneer
farmers) to fatten the wallets of his Wall Street owners, who elected him with
only 39% of the popular vote.
Abraham Lincoln declared his War was over taxes ONLY and not
slavery, at all.
If it fucked you up seeing a random pic on the internet, just imagine you're driving down the highway and see this ugly monstrosity with a confederate flag waving proudly in the proverbial breeze. You see more confederate flags around here than American. I'm moving soon.
Regarding your question, idk about wall street and I'm curious how old the memorial even is. It looks fairly new-ish and reeks of modern revisionist history. Can't really find many details and further research is making me nauseous so you're welcome to investigate.
Any time any "alternative facts" are presented against things like the cause of the Civil War or the holocaust, even 100% sarcastically, it's important to follow them up with what actually happened. Otherwise you end up with a The_Donald situation, where idiots who can't tell the difference between parody and reality end up in positions where they can legitimately rewrite history to fit their own narrative.