The Republic of South Africa is a country located on the very south of Africa. Its rich resources (most notably diamonds) have led it become an ethnically diverse part of the world, which in turn has led it become a very conflicted country. In addtion to native peoples, such as the Zulu and the Xhosa, the country was a colony first of the Dutch and then the British. In the early 20th century, South Africa gained limited independence as a British dominion. It instituted a rigid legal separation of the races called apartheid in 1948, which stayed in effect until the 1990s.
The Union of South Africa was the only independent country in Africa; the rest of the continent had been divided up among Germany, Italy, Spain and Portugal after their victory in World War II. The "Aryan-dominated" Union of South Africa was an ally of the Greater Germanic Reich, not a conquest.
South Africa was a British dominion during World War II. During that war it aligned itself with the Allies. During the Race's invasion of Tosev 3 in the 1940s, South Africa was quickly conquered by the Race along with the rest of Africa. The South Africans, who had bitterly resisted British imperialism, accepted the Race with relative docility in comparison to many of the species's other colonial subjects. The nation's laws of racial segregation were nullified by the Race rule, as the black population there were eager to side with the aliens. For their part, the Race found classification by skin-color to be completely arbitrary.
Following the arrival of the Colonization Fleet in the 1960s, South Africa was heavily colonized by the Race, and many animals from Home were released into its rich ecosystems. Resistance against the Race was limited, but did continue.