[seanmcdirmid]

The North American tribes had plenty of warfare and territory turn overs long before the Europeans arrived. The isolation of the americas did prevent diffusion of technology, but we also saw the same thing happen in Africa and even Asia to similar extents. It wasn't very unique.

[agumonkey]

Sorry I meant after the United states formed. They became the only player on that area weren't they ?

I always oppose their situation to Europe where many similarly large countries were shoulder to shoulder.