How did the Huns exemplify the problems faced by the later Roman Empire?

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The Huns exemplified the problems faced by the later Roman Empire in that they were an outside force that played a negative role in the empire's fate. They invaded Roman territory and put pressure on other barbarian tribes to migrate into Roman lands as well. However, outside forces such as the Goths also played a positive role in the empire's fate by providing soldiers and creating alliances.

How Did the Huns Exemplify the Problems Faced by the Later