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.
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.