What was the reason for the downfall of the Han Dynasty and The Roman Empire?

Was is partially invasion from barbarians?

Han Dynasty:
http://www.google.com/search?q=han+dynasty+downfall&ie=utf-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a

Roman Empire:
http://www.google.com/search?q=roman+empire+downfall&ie=utf-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a

Good info in these results.

=)

what is a civil war

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