Step 1: Understanding the Question
This is a factual question asking to identify the first black President of South Africa. This relates to the chapter "Nelson Mandela: Long Walk to Freedom".
Step 2: Key Concept
The chapter is an excerpt from the autobiography of Nelson Mandela. It details his struggle against the apartheid regime in South Africa and his inauguration as the first democratically elected black president of the country.
Step 3: Detailed Explanation
Nelson Mandela was a revolutionary leader and the central figure in the fight against apartheid. After spending 27 years in prison, he was released and went on to win the first fully representative democratic election in South Africa in 1994, becoming the nation's first black president. The other individuals listed (Oliver Tambo, Yusuf Dadoo, Walter Sisulu) were also important anti-apartheid activists but did not hold the position of the first black president.
Step 4: Final Answer
Based on historical facts and the context of the literary chapter, Nelson Mandela was the first black President of South Africa.