The Correct Answer is:
There were five reasons: Political, economic, foreign invasion, social and military reasons
Political Reason: There was no written rule about the succession to the Emperors throne.
Economic Reason: HIgher taxes for the citizens, rising unemployment, and inflation.
Social Reason: Many romans became lazy and luxury loving.
Foreign Invasion Reason: While the Romans fought each other over politics and money, they left their frontiers open for attack.
Military Reason: Army was not loyal to country; it was loyal to person who pays them. They had barbarians serve in the Army as mercenaries, who were not loyal.
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-Austint1414