Why was Seretse Khama exiled from Bechuanaland in 1950?

In 1950, the British government exiled Seretse Khama from the Bechuanaland Protectorate and barred him from the chieftainship of the Ngwato people.12

This action was taken to appease the South African government, which strongly objected to Khama’s 1948 marriage to Ruth Williams, a white British woman. At the time, South Africa was reinforcing racial segregation under the system of apartheid, and the British government’s decision—confirmed by secret documents—demonstrated the extent to which the protectorate’s administration was subordinated to South African interests. Khama remained in exile until he agreed to renounce the chieftainship in 1956.312