What did nelson Mandela do that made him president?

Nelson Mandela became president of South Africa in 1994 after leading a long struggle against apartheid, a system of racial segregation and discrimination. He was a key figure in the African National Congress (ANC), advocating for equal rights and democracy. His leadership during negotiations to end apartheid and his commitment to reconciliation helped him gain widespread support. Mandela won the first multiracial elections in South Africa, marking a historic transition to democracy.