Sumer (3500 B.C. – 689 B.C.)
Sumer (3500 B.C. – 689 B.C.). City-state organization Smelting of materials: Bronze Age, Iron Age Trading empire with other river valley civilizations (Egypt, India, China) = “Silk Road”. Wheel. The wheel was invented by 6000 BC! It helped military, farming and trade.
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