Neolithic Revolution as irrigation and deforestation which allowed the production of surplus food. Other developments found very widely are the domestication of animals, pottery, polished stone tools, and rectangular houses. These developments, sometimes called the Neolithic package, provided the basis for centralized administrations and political structures, hierarchical ideologies, depersonalized systems of knowledge (e.g. writing), densely populated settlements, specialization and division of labour, more trade, the development of non-portable art and architecture, and property ownership. The earliest known civilization developed in Sumer in southern Mesopotamia (); its emergence also heralded the beginning of the Bronze Age. The relationship of the above-mentioned Neolithic characteristics
Neolithic Europe in southeastern Europe living in heavily fortified settlements of 3,000-4,000 people (e.g., Sesklo in Greece) whereas Neolithic groups in Britain were small (possibly 50-100 people) and highly mobile cattle-herders. The details of the origin, chronology, social organization, subsistence practices and ideology of the peoples of Neolithic Europe are obtained from archaeology, and not historical records, since these people left none. Since the 1970s, population genetics has provided independent data on the population history of Neolithic Europe, including migration events and genetic relationships with peoples in South Asia. A further independent tool, linguistics, has contributed hypothetical reconstructions of early European languages