Why did the Roman Empire fall, You can give me multiple reasons.

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.

Explanation:

unless they converted, many non-christians (mainly jews and muslims) were persecuted

51% were unhappy, i think .   ; )