20 October 1915
The second general election was held in the Union of South Africa with the National Party (NP) participating for the first time. The main point at issue was whether South Africa should continue to support Britain's war effort and the results was a clear indication of the growth of Afrikaner nationalism. The party managed to make their political existence felt when it emerged as the third largest party, with twenty-seven seats in the Union Parliament. It secured seven in the Cape Province, sixteen in the Orange Free State and four in the Transvaal. The results for the other political parties counted as follows: South African Party fifty-four seats; the Unionists thirty-nine; four for the Labour Party, while independent candidates won six. General Louis Botha again became prime minister, but many of his followers voted for the new party under General J.B.M. Hertzog.
References

Wallis, F. (2000). Nuusdagboek: feite en fratse oor 1000 jaar, Kaapstad: Human & Rousseau; Swart, M.J., et al. (eds)(1980).| Muller, C.F.J. (ed)(1981). Five Hundred years: a history of South Africa; 3rd rev. ed., Pretoria: Academica, p. 404.