The “Mandela Effect” is caused by Time Travel
The reason why so many South Africans recall Nelson Mandela dying in prison is because some guy from the future went back to time to change Nelson’s fate and make him President of South Africa.
But, in the future, the Government eventually banned time travel because people kept going back to do things like take the monocle off the Monopoly guy or change the Toons in Looney Toons into Tunes and it was just annoying so they just said “no, no more of that” and banned it.
People always gotta fucking ruin things, man.