Basically they will have to learn to smelt iron before they really develop.
Arguable (wikipedia claims there was some early smelting in Africa), but your comment is much kinder than what I was about to post in the same vein, so I will desist.
95 posted on 08/09/2016 12:35:04 PM PDT by Moltke
(Reasoning with a liberal is like watering a rock in the hope to grow a building)