Explain why archeologists believe that the construction of the earliest Indus Valley cities was carefully planned out. What are the two largest ancient cities that have been discovered in the Indus Valley?

Since the streets and buildings were laid out in a grid pattern, archaeologists claim the earliest Indus Valley cities were planned. Only a well-planned city could have kept its framework intact while being built. Harappa and Mohenjo-Daro are the two most important cities discovered in the Indus Valley.

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