In Decades of Darkness, the Kingdom of South Africa was formed out of three British colonies (The Cape, Natal, and Beachunaland) and three Boer Republics (Orange Free State, Transvaal, and Maritizia) on January 1st, 1901. It was formed six years after the conclusion of The Kingdom War and due to problems among the Afrikaner delegation, rules regarding apartheid are never put into place and the capital is placed in Cape Town instead of Pretoria, known as Retief in this TL. South Africa took advantage of the Portuguese Bankruptcy of 1920 to annex all lands south of the Zambezi River. South Africa also played a large role in The Great War, capturing German Mozambique and annexing those territories. After the Great War, much of the country prospered and progressive reforms took a hold of the Kingdom. South Africa stands in 1948 as a prosperous, integrated nation apart of The Restored Empire.
Cape Colony was originally settled by the Dutch in the early 1600's and was captured by the British in the 1770's. Resentful at British policies, the rural Dutch Farmers or Boers began the Great Trek, which was bolstered by more German and Dutch immigrants in OTL. Ultimately they set up four states; Orange Free State, Transvaal, Natalia, and Maritiza. Natalia was overrun by the British in the mid 1850's and tensions began to mount between the remaining Boer States and the British authorities in the Cape when gold was discovered in Witwatersland in 1881. The Cape, led by Frederick Morton began advocating a war to conquer the increasingly uncooperative Boer states. Eventually in 1893, the Boer Republics declared war on the British Empire, sparking off the Kingdom War.
The government system of the Kingdom of South Africa is a Parliamentary System based closely on the British parliament, far closer than OTL South Africa (because of a larger British presence).
South Africa has approximately twice the white population that it possessed in OTL. This puts the Boer population itself at around thirty percent, giving them a much smaller say in the politics and Afrikaans is reduced to a second tier language. English is adopted as the majority language to be taught in schools, but most schools teach Afrikaans alongside the main language. Anglo traditions of Westminster style reforms and a more progressive atmosphere among the immigrants leads to no formal law system of segregation; although there is a considerable amount of societal racism (as with most societies).
During the 1910's and the 1920's, immigration from all parts of the Empire brought a large population of Indians, Filipinos and Malays to South Africa, about twice that of OTL. This has led to a very diverse and cosmopolitan atmosphere among the cities of Brisbane and Delgola. The Indian population actually gained suffrage quite early and helped to gain some legitimacy for the movement toward complete suffrage for all races.