Identify and explain one political similarity shared by at least two river valley civilizations and explain why that similarity exists.

One political similarity is the rise of monarchies. As people started getting surpluses and amassing wealth through trading them, there were those who became wealthy and powerful and established themselves as rulers. This happened in areas like Egypt where Pharaohs started rising and Mesopotamia where there were also kings.

Iwould say all the above personally but i think the desert would be d