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Supposing -- the "how" notwithstanding -- the Neo-Babylonian revolt is averted, and the Assyrian Empire is still (essentially) intact circa 550 BC? Does Cyrus the Great, or someone like him, still emerge in the east around this time? If so, does Assyria fall straight to him? Primary question, how is Middle Eastern history and civilization altered, and what are the butterflies from there?
CONSOLIDATE: Also, I realize a similar thread was done some years ago...