Answer:
You asked for 3, but I'll still go ahead and give you 8.
Step-by-step explanation:
Invasions by Barbarian tribes. ...
Economic troubles and overreliance on slave labor. ...
The rise of the Eastern Empire. ...
Overexpansion and military overspending. ...
Government corruption and political instability. ...
The arrival of the Huns and the migration of the Barbarian tribes. ...
Christianity and the loss of traditional values.
Hope this helped!