Answer:
Invention of letter, creation of first states and building of ziggurat.
Explanation
In the area of Southwest Asia first civilizations appeared. That is were the first Sumerian city states, such a Ur, Uruk, Akkad, Lagash, etc were created. Not only that, but also the first written letter appeared. All of this city-states created the temples, inside which they honored their gods. The name of those temples is ziggurat.
