Forgive me if this has been brought up.
The Conquistadors brought the horse to the Americas and the Indians quickly adapted to use this new resource. That is one of the most blatant examples, but potatoes in Irelend, sugar, cotton, spices, etc. world wide. Some resources should be able to be transpanted intentionally or not to similar environments.
If you have horse and invade someone without it, they can spawn that resource if the environment allows, like the great plains. I don't see why this would not apply to sheep, llama, yams, beans, rice, cows, etc.
Also, how come chickens never get any love as a resource? They are one of the cheapest and easiest sources of protein anywhere! I give thanks for the mighty chicken that gives me eggs, fried chicken, grilled chicken and other chicken recipies too numerous to mention. What is bacon without eggs? It is like a hamburger without fries, perish the thought.
Does anyone think it really took much for most prehistory people to think, wow, they have a long pointy stick that is hard to break! Maybe we should make long pointy sticks too! We will call them, eh.... spears! yeah, spears! People adapt and do it damn fast. Look at China, it was a backwater only a few decades ago and everyone dismissed them. Now they hold treasury notes to the world. Things change, whether you want them to or not.
I would like to see this dynamic in Elemental.