The Indus Valley civilization dates back to when

he roots of the Indus Valley civilization can be traced back to the site of Mehrgarh in Pakistan dated to about 7000 BC. The civilization reached its peak around 2600 BC and it went into decline around 1900 BC. It depends on what you mean. Kot Diji civilization as the start? in this case around 3000 cal BCE.

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explanation:

answer; people where able to travel across the u.s.a faster than any other mode of transportation,travel time was about a week,from coast to coast