East Asia and South Asia can be seen as the collective history of Asia
In China, the Indus Valley, and Mesopotamia the civilization shared many similarities and likely exchanged technologies and ideas such as the wheel and mathematics .
Nomads from the central steppes could reach all areas of the Asian continent.
The northern part of the continent, covering much of Siberia were very sparsely populated.
The centre and periphery were kept separate by mountains and deserts that the steppe horsemen could only cross with difficulty.
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