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The Amorites were a Semitic people who seem to have emerged from western Mesopotamia (modern-day Syria) at some point prior to the 3rd millennium BCE. In Sumerian they were known as the Martu or the Tidnum (in the Ur III Period), in Akkadian by the name of Amurru, and in Egypt as Amar, all of which mean ‘westerners’ or ‘those of the west’, as does the Hebrew name Amorite.
From Amorite – Ancient History Encyclopedia:
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Shu-Sin (2037-2029 B.C.) attempted to forestall the encroachments of the tribal Amorites by the construction of his Wall of Mardu, or Amorite Wall. In 2034 BC he built ‘the Amorite wall’ in order to keep the city safe from barbarian attacks. But the wall did not hold them for long. The Amorites established themselves as rulers of most most of the numerous city-states and petty kingdoms into which Mesopotamia again quickly disintegrated.
From Wall of Mardu / Amorite Wall / Western Wall:
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This situation came to crisis during the latter part of the Ur III Period (also known as the Sumerian Renaissance, 2047-1750 BCE), when King Shulgi of the Sumerian city of Ur constructed a wall 155 miles (250 kilometers) long specifically to keep the Amorites out of Sumer. The wall was too long to be properly manned, however, and also presented the problem of not being anchored at either end to any kind of obstacle; an invading force could simply walk around the wall to bypass it, and that seems to be precisely what the Amorites did.
From Amorite – Ancient History Encyclopedia:
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This all took place around 2034 BCE: that is, around four thousand years ago. It seems that the idea of building symbolic walls that do nothing to prevent migration is not only not new but a fundamental human trait, as old as civilisations themselves.