History of the world
Whether in prehistoric or historic times, people always needed to be near reliable sources of potable water. Settlements developed on river banks as early as 3000 BCE in Mesopotamia, on the banks of Egypt's Nile River, in the Indus River valley, and along China's rivers. As farming developed, grain agriculture became more sophisticated and prompted a division of labour to store food between growing seasons. Labour divisions led to the rise of a leisured upper class and the development of cities, which provided the foundation for civilization. The growing complexity of human societies necessitated systems of accounting and writing.
History of Western civilization before AD 500
The earliest civilizations which influenced the development of the West were those of Mesopotamia, the area of the Tigris–Euphrates river system, largely corresponding to modern-day Iraq, northeastern Syria, southeastern Turkey and southwestern Iran: the cradle of civilization. An agricultural revolution began here around 10,000 years ago with the domestication of animals like sheep and goats and the appearance of new wheat hybrids, notably bread wheat, at the completion of the last Ice Age, which allowed for a transition from nomadism to village settlements and then cities like Jericho.