" Assyria had no more prospect of halting the human flow than can the British government stop illegal entrants to the UK, although an effective natural moat surrounds the British Isles. There is little hope that the US Department of Homeland Security will have greater success with its border fence than did King Shulgi of Ur and his successors, whose ‘wall to keep out the Amorites’ failed to prevent the migrants’ eventual takeover of all lower Mesopotamia and their founding of Old Babylon. "

― Paul Kriwaczek , Babylon: Mesopotamia and the Birth of Civilization