The Barbarian attacks on Rome partially stemmed from a mass migration caused by the Huns' invasion of Europe in the late fourth century.
Constant wars and overspending had significantly lightened imperial coffers, and oppressive taxation and inflation had widened the gap between rich and poor.
Eastern Roman Empire or Byzantium rose to existence by the foundation of the city Constantinople in 324 AD, and the final division to Eastern and Western Roman Empire did not happen until 395 AD.
The Roman Empire stretched from the Atlantic Ocean all the way to the Euphrates River in the Middle East, but its grandeur may have also been its downfall. With such a vast territory to govern, the empire faced an administrative and logistical nightmare
Corruption reduces the stringency of environmental regulations, but the effect disappears as political instability increases
The troubles in the Roman Army were due to civil wars and a decrease of the quality and quantity of soldiers protecting the Empire.