What are 2 major obstacles Nelson Mandela had gone through?

The first black president of South Africa, and perhaps the reformer most responsible for the dismantling of apartheid in that nation, Nelson Mandela worked through many obstacles on the way to his great achievements. Just one was the apartheid-system itself, which led to hardship and loss of opportunity in his youth and early adult life. Yet another was the 27-year-long imprisonment that he endured as a result of his principled attempts to overthrow apartheid.