who are the four prime Minister who ruled south Africa between 1948 and 1976

The four Prime Ministers who ruled South Africa between 1948 and 1976 were:

1. Daniel François Malan (1948-1954)
2. Johannes Gerhardus Strijdom (1954-1958)
3. Hendrik Frensch Verwoerd (1958-1966)
4. Balthazar Johannes Vorster (1966-1978)