Union of Soviet Socialist Republics (União de Sul África)

This was formed during the Russian Revolution in 1915, when

The revolution
After the famine of 1915, people began to listen to the likes of Lenin and Trotsky. ultimately, they revolted, forcing the Tsar and his family into exile, seizing their property in the process (during the "sweeping away of the Tsar, Stalin got killed while trying to assassinate them, thus preventing the tyrannical regime of OTL)

Tricorner alliance
After a botched attempt by Japan and Britain to crush the USSR, they turn to the United States and South Africa to form an alliance which would last to the present day. The Soviets would be a vital ally for the US and South Africa because of the massive oil reserves.