I don't recall the Secret History of the Mongols even mentioning the Great Wall. It's been a while since I read it though.
<Snipped quote by ArenaSnow>
China has a wall and almost no Mexicans, so I'd say they're the masters of preventing foreign invasion.
So all we need now is a Chinese architect.
that's because capitalism isn't functional.
Uh... cookies guy here.
Someone mentioned it and knew what it was!