There is no evidence whatsoever the Mongols, any more than any other Asiatic people, would ever have accomplished anything notable. Past performance here is an indicator of future success. (By notable, I mean enduring additions to mankind; conquest itself is not notable.). I said nothing about Americans; it is the West, Christendom, that has done everything that matters for the modern world to exist as it is (good and bad). This is objectively obvious and provable; it is not a founding myth.