Final answer:
Nelson Mandela joined the African National Congress to fight apartheid policies and promote racial equality and human rights.
Explanation:
Nelson Mandela joined the African National Congress (ANC) in response to the oppressive apartheid policies implemented by the white South African government in the 1940s. As a member of the Xhosa royal family, Mandela became actively involved in politics and the fight against racial segregation. Despite his commitment to non-violence, he eventually resorted to acts of sabotage against the government, leading to his arrest in 1962 and subsequent imprisonment.
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