J. B. M. Hertzog became the Prime Minister of South Africa on 30 June 1924, replacing Jan Smuts. Hertzog led four cabinets, serving until 5 September 1939.
The general election of 1924 led to the first political transition since the formation of the Union of South Africa in 1910. The training that J. B. M. Hertzog between 1924 and 1929 government was a coalition between the National Party (NP) and the Labour Party (LP).
The 1929 general election was won by the National Party (41% of votes) due to its absolute majority in seats (78) facing the South African Party who had received 47% of the vote, but only 61 representatives. Although the National Party had a majority government, Hertzog renewed the electoral alliance with the Labour Party (8 elected), Frederic Creswell