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
Bronze Age Britain the Late Neolithic continued to be constructed or modified, including such sites as Avebury, Stonehenge, Silbury Hill and Must Farm. This has been described as a time "when elaborate ceremonial practices emerged among some communities of subsistence agriculturalists of western Europe". There is no clear consensus on the date for the beginning of the Bronze Age in Great Britain and Ireland. Some sources give a date as late as 2000 BC, while others set 2200 BC as the demarcation between the Neolithic and the Bronze Age. The period from 2500 BC to 2000 BC has been called the "Late Neolithic/Early