>>17873078
>It's obvious but nobody wants to talk about it.
Because it's a retarded theory, doesn't account for East Asians development nor does it acount for Native Americans relative lack of development, and it's unlikely the timeframes involved (on the order of less than 100,000 years) is long enough for significant evolutionary divergance to occur. Geography plays a role, but not in the way you think it does. Africa was underpopulated relative to its size prior to the 20th century, and population density, typically caused by geographic bottlenecks such as foothills, coastlines and rivers, are what lead to the formation of permanent city-states and civilization.
Sub-Saharan Africa did develop city-states along the Mozambique Channel in the form of fishing villages and facilitated trade with Madagascar, but we don't think of them in the same way we think of City-states of MENA and Europe because they were typically semi-permanent only rather than fully permanent construction.
