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Several reasons all played a part.
1- Roman citizens were allowed to join the auxilleries who had a far lighters term of enlistment and service than the legionares (although at only 1/3 or so the pay)
2- Plague that killed off a great many citizens in the west
3- Shifting of the remaining legions to mesopotamia to fight the persins letting the Germans invade
4- Collapse of the tax system
5- Rise of greek casuign the empire to devlop two different cultures
6- wars of imperial succession
7- religious strife once Christianity was the "offical religion"
8- Hunnish invasion
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