Why didn't sa sign the UDHR in 1948?

South Africa did not sign the Universal Declaration of Human Rights (UDHR) in 1948 primarily because of its apartheid policies, which institutionalized racial segregation and discrimination. The South African government, led by the National Party, was concerned that the principles outlined in the UDHR would challenge and undermine their system of racial inequality. Additionally, the regime sought to maintain its sovereignty and control over domestic affairs without external interference regarding human rights.