If any scp was actually real, what scp would match up wth how history is going and what is happening currently?
Kalinin's Proposal, but I am sure that he wrote it that way.
SCP-081 might be a good candidate. Then again, I'm no expert on the phenomenon in the slightest and there might be an explanation on it already.
I'm tempted to include SCP-189 in here as well because of the delightfully horrific idea that it could exist.