World History Chronology

Evolution of Hominids

Foraging Societies

Settled Agriculture

Primary Urbanization

Classical Empires

Unification of Eurasia

Unification of the Hemispheres

Formation of World Culture

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Primary Urban Society

3,500 BC to AD 700

"Primary Urbanization" refers to the first development of cities in a particular region. Generally speaking, historians believe that urban society was developed independently in at least six regions: Mesopotamia, Egypt, the Indus Valley, the Yangtze River Valley, Mesoamerica and the Andean Altiplano. From these original centers it diffused to the rest of the world.

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