Answer:
1806.
Step-by-step explanation:
Great Britain is the first country who imperialized South Africa in the year 1806 by making first colony in South Africa. South African countries which was colonized by Britain are Northern Rhodesia (Zambia), Southern Rhodesia (Zimbabwe), Nyasaland (Malawi), Lesotho, Botswana, and Swaziland. They made colonies there in order to gain benefits from natural resources and industries. They captured these regions by using military forces.