The first reason they fell Is due to Christianity. It took a few centuries to gain enough support and followers to gain empirial support. Priest decided the fate of Rome. They defied the empers and conflicted with the work of the empire.
Decay was another reason they failed. Rome got to big to control and there was a lot of corruption. Decay of the once unbeatable army left them weak to anyone invading. Another reason for the weak military was the lack of training they received. The lack of control of the corruption meant that peoples things were being stolen.
The economy of Rome was a third reason they failed. There was a great deal of inflation making goods more expensive for the people to buy. They also had poor trade Which caused poor circulation of money. The barbarians that were looting treasury's were causing an economic downfall that lead to the end of the Roman Empire.
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