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I'm sure that there have been a lot of WI scenarios abou the Roman Empire. I excuse myself if this isn't alternative but more of a question for a better understanding:
Why did all the technological and cultural achievements perish with the fall of the Western Roman Empire? The Romans didn't dissapear just over night, so why couldn't they pass their knowledge to further generations or to the Germanics before merging with or being absorbed by them?

And also: Why did the once outlawed Christianity became so successful in the Roman Empire? Constantine once converted to Christianity in the 4th century AD, but what about the West?
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