[The Conversation Africa] Jan Christiaan Smuts (1870-1950) and Nelson Rolihlahla Mandela (1918-2013) belonged to and were shaped by two different epochs in South Africa, yet left an indelible mark on its history. Sociologist Roger Southall has brought them together, so to speak, in a book, Smuts & Mandela, The Men Who Made South Africa. Among the many parallels he draws between the two men - one a racist white supremacist and the other a non-racialist and African nationalist - is that they were both nation-builders. Smuts made