Sumerian City-States (15h 3min, jan 24, 4000 y BC – 18h 17min, oct 11, 2340 y BC)
Description:
The world's first civilization. They were skilled in many things, like math, astronomy, and the wheelAdded to timeline:
Date:
15h 3min, jan 24, 4000 y BC
18h 17min, oct 11, 2340 y BC
~ 1660 years