Answer:
Invasions by Barbarian tribes. The most straightforward theory for Western Rome's collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s “barbarian” groups like the Goths had encroached beyond the Empire's borders.
The barbarian tribes were a major cause of the decline of empires in ancient times.
In Europe, there had been 5 fundamental barbarian tribes the Huns, Franks, Vandals, Saxons, and Visigoths (Goths), and they all hated Rome. The Barbarians have been destroying Roman towns and cities in the outer areas of the empire.
The crossing, or 'barbarian invasion' of 406 brought about a breakdown of primary Roman energy along the Rhine frontiers and arguably instigated the usurpation of Constantine III, an insurrection that provided a grave risk to the Western Emperor Honorius.
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