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
Acting prime minister Minister, served as Acting Prime Minister for six days, after Norman Kirk died in office in 1974. Deputy Prime Minister Winston Peters was serving as Acting Prime Minister as of 21 June 2018 until 2 August 2018, while Jacinda Ardern took maternity leave. Prior to the establishment of the Deputy Prime Minister role, a senior Minister would be appointed to act as Prime Minister when, for example, the incumbent was travelling overseas. In the current era, when both the Prime Minister and Deputy Prime Minister are unavailable, the next highest ranking minister who is available will be asked to act