What is the difference between the Assyrian state and the Persian one?

Ancient Assyria was a state of cruel rulers. Its difference from the Persian Empire was: the size of Assyria was much smaller than the size of Persia; Assyria was not divided into satrapies; The Assyrian rulers were very tough on the conquered peoples.
Assyria itself existed for a century before the emergence of the Persian state, its fall was due to the uprising that the Babylonians raised along with the Medes.

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