Those are made by Ironforge dwarves who have had an industrial revolution and live in fascism now. Their cousins are not so advanced.
Those are made by goblins, who have had an industrial revolution and live in capitalism.shredders, zeppelins
As we can see their formations range from hunter-gatherer to military communes.The orcs are aliens from a different planet.
But we are talking about human and elven kingdoms.
An Easter egg.What about the harvest golem we see in westfall?