Answer: Several key factors led to the collapse of the Western Roman Empire.
Step-by-step explanation:
Before the official collapse, the Roman Empire had many symptoms that indicated weaknesses. Many historians believe that the reason for the weakness and decline is the taking of mercenary forces. These troops were not sufficiently organized and efficient as a permanent Roman army. Mercenaries in the military ranks were not a good idea. The reasons for the fall of Rome did not happen "overnight"; it is a process that lasted a long time.
The incursions of barbarian tribes led to the weakening of all institutions. One section of historians believes that the rise of Christianity led to ruin. Namely, according to Christian teaching, if they follow certain rules, people will have an eternal world full of grace. Because of that, many soldiers surrendered to these ideals and did not care much for the earthly. The Roman Empire did not completely collapse. Its eastern part lived for another 1000 years. The empire could not last any longer, it was weakened for too long, and it is a real miracle that the Western Roman Empire did not fall earlier.