Answer:
I. invasions by barbarian tribe
2. weakening of the roman legion
3 government corruption and political instability
Explanation:
1. rome had tangled with germanic tribes for centuries but by the 300's "barbarian"
groups like the goths had encroached beyond the empire
2. unable to recruit enough soldiers from the roman citizenry, emperor's like goths and other barbarians
3. being the roman emperor had always been a particularly dangerous job, but during the tumultuous second and third centuries it nearly became a death sentence.
.
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hope this makes sense and helps
