True urbanism emerged independently in at least six regions between 4000–1000 BCE, each anchored by reliable agriculture and water management.
Uruk, Ur, Eridu (from ~4000 BCE). First writing (cuneiform), monumental temples (ziggurats), state bureaucracy.
Memphis, Thebes, Hierakonpolis (from ~3500 BCE). Centralized pharaonic state, pyramid builders, grain-based economy.
Mohenjo-daro, Harappa, Dholavira (2600–1900 BCE). Grid planning, advanced sanitation, standardized weights, undeciphered script.
Erlitou, Anyang (Shang Dynasty, ~1600 BCE). Bronze ritual vessels, oracle bones, walled cities, ancestor cult.
Teotihuacan (100 BCE–550 CE), Maya cities (Tikal, Calakmul). Pyramids, ballcourts, maize-intensive, no wheeled transport.
Caral (2600 BCE, oldest Americas city), Chavín, Tiwanaku. Maritime foundations, llama/camelid pastoralism, vertical archipelagos.
Surplus agriculture → specialization → social stratification → monumental architecture → writing/record-keeping (except Andes) → state formation.