Nelson Rolihlahla Mandela (18 July 1918 – 5 December 2013) was a South African anti-apartheid revolutionary, political leader, and philanthropist, who served as President of South Africa from 1994 to 1999. He was the country's first black head of state and the first elected in a fully representative democratic election. His government focused on dismantling the legacy of apartheid by tackling institutionalised racism and fostering racial reconciliation. Ideologically an African nationalist and socialist, he served as President of the African National Congress (ANC) party from 1991 to 1997. 
Contrary to the name of the effect, this Mandela Effect is not as widely experienced as others, such as the [Berenstain Bears]. The Mandela Effect is that Nelson Mandela died in prison during the 1980s, rather than in 2013 after becoming president of South Africa.
Unlike many other Mandela Effects, there currently appears to be no documented residue for this particular effect.
One theory is that people are simply mistaking Nelson Mandela for Steve Biko, another activist who died in jail in the 1970s. 
- Perhaps It wasn't Mandela, But Steve Biko?|https://www.reddit.com/r/MandelaEffect/comments/7473qn/perhaps_it_wasnt_mandela_but_steve_biko/