One need not be intelligent to see it, but one need be unintelligent not to see it.
Grand unification need not be of one particular form, which is impossible, but it does require one centralized authority. 溫鐵軍 has a good argument for the failure or unsustainability of the Roman version: the empire rimmed around the Mediterranean sea and hence lacked geographical depths to absorb invasions from the "barbarians".
The USA seeks (and largely successfully)this unification in the demanded form too: the Western colonial power framework over the whole globe with itself on top with all its values forced upon the world.
