Asia
The coastal periphery was home to some of the world's earliest known civilizations, each of them developing around fertile river valleys. The civilizations in Mesopotamia, the Indus Valley and the Yellow River shared many similarities. These civilizations may well have exchanged technologies and ideas such as mathematics and the wheel. Other innovations, such as writing, seem to have been developed individually in each area. Cities, states and empires developed in these lowlands.
Ancient history
The first civilization emerged in Sumer in the southern region of Mesopotamia now part of modern-day Iraq. By 3,000 B.C, Sumerian city states had collectively formed civilization, with government, religion, diversity of labor and writing. Among the city states Ur was among the most significant.
In the 24th century BC, the Akkadian Empire was founded in Mesopotamia. From Sumer, civilization and Bronze smelting spread westward to Egypt, Minoa and the Hittites.