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 10th millennium BC is the earliest given date for the invention of agriculture and the beginning of the ancient era. Göbekli Tepe was erected by hunter-gatherers in the 10th millennium BC (c. 11,500 years ago), before the advent of sedentism. Together with Nevalı Çori, it has revolutionized understanding of the Eurasian Neolithic. In the 7th millennium BC, Jiahu culture began in China. By the 5th millennium BC, the late Neolithic civilizations saw the invention of the wheel and the spread of proto-writing. In the 4th millennium BC, the Cucuteni-Trypillian culture in the Ukraine-Moldova-Romania region develops. By 3400 BC, "proto-literate" cuneiform is spread in the Middle East. The 30th century BC, referred to as the Early Bronze Age II, saw the beginning of the literate period in Mesopotamia and Ancient Egypt. Around the 27th century BC, the Old Kingdom of Egypt and the First Dynasty of Uruk are founded, according to the earliest reliable regnal eras.