Em! For sure.
But the fact that people with perfect memories remember these things diffferently is what makes me think that there's a multiverse and it seems like we're combining. Or maybe it's like servers merging. This whole thing might just be a computer program. Tough to run a control experiment because I don't know how to get to a control universe :)
Or an organisation like the Ministry of Truth in 1984; testing our receptiveness to contradictory new histories.
We've always been at war with Eastasia.