What Stopped Rome's Unstoppable Empire in it's tracks
Scholars can debate about the one single cause of why the Roman Empire fell, but they can't find one because there isn't one. The Romans fell from external pressure and internal conflicts over time instead of one definite reason. The Romans lost the majority of their Western influence because of the Rise of Christianity and cultural change.
What caused them to fall?
The Rise of Christianity
Christianity was one the main factors that led to the collapse of the Roman Empire. Many people changed their religion from Rome's official Religion to Christianity after it was introduced.
Visigoths
Immigrants who migrated Westward after Attila and the Huns began their aggressive march westward. The Huns attacked Italy, destroyed German colonies in the Roman Empire, and invaded Hungary. This created thousands of refugees that fled to the Roman Empire, they then migrated and established colonies in Italy, Gaul, Spain, Britain, and North Africa.
The Rise of Christianity Cont
Several factors contributed to the rise of Christianity and the fall of the Roman empire. The concrete roads they built helped spread the influence of Christianity around. Christianity appealed to the lower class, women, and to slaves because in the religion everyone is born equal and you can live eternal life. This sounded much better because of the strict class system they had no power and were seen as much less important than the upper class.
Visigoths Cont
Rome was invaded in 410 C.E under the command of Alaric, and by that time the western part of Rome's empire was almost completely demolished. Rome was invaded again in 476 C.E and completely all of their western influence was removed when they were sacked and their Emperor Romulus Augustus was removed by Germanic general Odoacer.