Answer:
their migration and occupation of the conquered territories
Step-by-step explanation:
The Germanic tribes were very diverse as they were made up of people from different ethnicities such as the English people, the Jutes, the Danes, Swedens, Visigoths, Ostrogoths, Burgundians, Afrikans, Franks, the Geats, Gutes, etc. They were a group of people with strong military might. They united to conquer the Roman Empire and after that, they infiltrated every corner of the Roman jurisdiction.
The Roman Empire fell when Odoacer conquered Augustulus and took on the position of the King of Italy.