The Russian Civil War goes in favor of the Whites and in 1922 the Rand Rebellion becomes the Rand Revolution and the Union of South Africa becomes the People's Republic of South Africa.
"Workers of the world, unite and fight for a white South Africa!" was the actual slogan of the Communist Party of South Africa during the OTL revolt. Can you imagine a communist, white supremacist, South Africa?
Was actually about to post that.
My hometown, Benoni, is the only South African town that has been bombed from the air. It was a stronghold of the rebels during the Rand Revolt. It was a mining centre with lots of Cornish immigrants.