After World War I South - West Africa was declared a League of Nations Mandate to be administered by South Africa and after World War II it was supposed to become a United Nations Trust Territory .
South Africa objected and refused to allow South Africa to achieve independence .
After World War I South - West Africa was declared a League of Nations Mandate to be administered by South Africa and after World War II it was supposed to become a United Nations Trust Territory , but South Africa objected and refused to allow it to achieve independence .