Military history of South Africa during World War II Westminster with its head of state being the British king, the South African Prime Minister on 1 September 1939 was J.B.M. Hertzog – the leader of the pro-Afrikaner and anti-British National Party. The National Party had joined in a unity government with the pro-British South African Party of Jan Smuts in 1934 as the United Party. Hertzog's problem was that South Africa was constitutionally obligated to support Great Britain against Nazi Germany. The Polish-British Common Defence Pact obligated Britain, and in turn its dominions, to help Poland if attacked by the Nazis. When Adolf Hitler's forces attacked Poland on 1
Prime Minister of South Africa Prime Minister of South Africa The Prime Minister of South Africa ( was the head of government in South Africa between 1910 and 1984. The position of Prime Minister was established in 1910, when the Union of South Africa was formed. He was appointed by the head of state—the Governor-General until 1961 and the State President after South Africa became a republic in 1961. In practice, he was the leader of the majority party or coalition in the House of Assembly. The first Prime Minister was Louis Botha, a former Boer general and war hero during the Second Boer War.