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Some of us do not even know who Nelson Mandela is and why is he so important globally. Nelson Mandela was the former president of South Africa and perhaps the first black South African who held this elite position.However, world remembers him more because of his peaceful and non violent movement for providing equal rights to the black Africans in South Africa.elson Mandela was the former president of South Africa and perhaps the first black South African who held this elite position. However, world remembers him more because of his peaceful and non violent movement for providing equal rights to the black Africans in South Africa.
Quick Answer. Nelson Mandela was imprisoned for 27 years because he was found guilty of conspiracy and sabotage to overthrow the government of South Africa, together with other eight National African Congress Leaders. He was sentenced to life imprisonment in 1964 and was released in 1990 after serving for 27 years in jail.