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.
Nuragic civilization
In the Stone Age the island was first inhabited by people who had arrived there in the Paleolithic and Neolithic ages from Europe and the Mediterranean area. The most ancient settlements have been discovered both in central and northern Sardinia (Anglona). Several later cultures developed on the island, such as the Ozieri culture (3200−2700 BC). The economy was based on agriculture, animal husbandry, fishing, and trading with the mainland. With the diffusion of metallurgy, silver and copper objects and weapons also appeared on the island.