Sumer
Sumer () is the earliest known civilization in the historical region of southern Mesopotamia, modern-day southern Iraq, during the Chalcolithic and Early Bronze ages, and one of the first civilizations in the world along with Ancient Egypt and the Indus Valley. Living along the valleys of the Tigris and Euphrates, Sumerian farmers were able to grow an abundance of grain and other crops, the surplus of which enabled them to settle in one place. Prehistoric proto-writing dates back before 3000 BC. The earliest texts, from c. 3300 BC, come from the cities of Uruk and Jemdet Nasr; early cuneiform script emerged around 3000 BC.
Ancient history
The Ancient Near East is considered the cradle of civilization. It was the first to practice intensive year-round agriculture; created the first coherent writing system, invented the potter's wheel and then the vehicular- and mill wheel, created the first centralized governments, law codes and empires, as well as introducing social stratification, slavery and organized warfare, and it laid the foundation for the fields of astronomy and mathematics.