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Ok let us assume that Julius Ceaser had not been assassinated but had a founded a stable dynasty of leaders descended from him.And the government had been stable,and had not had to deal with thethe crisis of the 3rd century AD,Christians did not rise to power in the 4th century (instead from their founding they had remainded a small sect of the jewis religion), during which time the system of dual rule did not develop and the roman empire remained stable and undivided ,the legions strong and it

How would they have dealt with the invading Germans and Huns from the east,and the attacks of the later Islamic Empire into Roman lands?

What would things have been by the 1800's if the Roman Empire remained intact and stable?
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