Nothing.
the Persian empire
Personally I believe that the Assyrian Empire accomplished the most because they created the aqueducts and developed very good war strategies. Other than that the Neo-Babylonian Empire invented the sundial and introduced us to the calender and the 60 min in one hour. Also they started astronomy, which back then was a very serious matter.
The Persian Empire was not a Mesopotamian empire - it included Mesopotamia as merely one of it's twenty provinces which stretched from Libya to today's Pakistan..
the assyrian empire is the monotheists
There were six major Mesopotamian empires. These consisted of the empire of Sumer, the Akkadian Empire, the Babylonian Empire, the Assyrian Empire, the Chaldean Empire, and the Persian Empire.
The Mesopotamian empire is made up of irrigation cuneiform artisans kings and more if this did not help you check out Google.
Part of the Mesopotamian civilisation.
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most important features of mesopotamian geography ?
well... they were the first empire in history. does that count?
Iraq.