Harappan Civilization's writing has never been decoded. Harappan Civilization is a part of the Indus Valley Civilization. The languages of the Harappan Civilization belong to the Bronze Age and they are still today a mystery. This language is totally unattested to any source that is readable. This is one mystery that is yet to be solved.
Answer: the new military technology.
Explanation:
There was agriculture developed there so it mean that there was enough food for both the people and the cattle. Also there were many trading routes through the area so it was possible to sell anything animal related, from food to clothes to leather armors to anything that you could think of.
A kush controlled all of Egypt at one point.
