When referring to Buckle’s single factor theory, the premise was that the environment is a critical factor for nations to flourish. It is all about the climate. South Africa is one of the countries that have fertile soil and warm climate. Hence it survives on growing fruits and vegetables and the extraction of some minerals.
Huntington’s single factor theory has a lot to do with the climate. It is linking climate and productivity, with implications for nations over time. The warm temperatures in South Africa, the productivity rate can be higher.
Herbert Spencer’s single factor theory deal with the natural selection / survival of the fittest in the social world. This means that the survival of the species is dependent on the species itself. In order to survive, the need to find a way and pass that on the next generation to ensure that the species does not go extinct.