Presidents and Prime ministers of South Africa By Estée 1910 First Prime Minister Botha elected South African Party 1919 Smuts elected South African Party 1924 Hertzog elected First from Nationalist Party but later joins the United Party 1939 Smuts re-elected United Party this time 1948 Malan elected Nationalist party 1954 Strijdom elected National party 1958 Verwoerd elected National Party