People fall due to different factors. Weakening of the Roman legions is one of the least reasons for the end of the Western Roman Empire?
This was due to mainly the Invasions by Barbarian tribes. It is known to a key factor that brought the end of the Western Rome's empire as it did collapse.
Other reasons were string of military losses that they had sustained against outside forces. Rome was known to have issues with Germanic tribes and they encroached into the Empire's borders.
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