Trade was the motivating factor. The silk road accross Asia was besieged by bandits & required bribes to a number of nations to transport goods to & from Asia. Therefore a sea route would be a much safer & less expensive means of getting trade goods to & from Asia.
The Indus Valley, they as a people where polytheistic and there civilization was made up of Hinduism, Buddhism and Jainism.
They could not vote or hold government office.
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