What did the harappens and Mesopotamians in common?
Well, there's countless that they did have in common. To get to
the point, though, they were both South Asian civilizations of
antiquity, and even traded with each other a lot, as their
respective coins have been found far away from where they would
have been minted. They ahead of their times, as is evidenced by
their mathematical, philosophical, cultural, political, and
architectural splendor, and if you look around them there's mostly
just nomads surrounding (nomads who tended to attack the wealthier
sedentary communities). So they were both also islands of
civilization in their areas, for the most part. Of course, Egypt
was the Mesopotamians' neighbor to the southwest, but then there
were deserts and some miles of distance separating them...