WORLD CIVILIZATION

Detailed explanation-1: -After Mesopotamia was occupied by the Amorites and Babylonians in the early second millennium B.C., the Sumerians gradually lost their cultural identity and ceased to exist as a political force. All knowledge of their history, language and technology-even their name-was eventually forgotten.

Detailed explanation-2: -Sumer was the region’s earliest known civilization and ended with the downfall of the Third Dynasty of Ur around 2004 BCE. It was followed by a transitional period of Amorite states before the rise of Babylonia in the 18th century BCE.

Detailed explanation-3: -The Sumerian civilization collapsed c. 1750 BCE with the invasion of the region by the Elamites. Shulgi of Ur had erected a great wall in 2083 BCE to protect his people from just such an invasion but, as it was not anchored at either end, it could easily be walked around – which is precisely what the invaders did.