Final answer:
The western Roman empire collapsed due to internal and external factors including political instability, economic decline, social unrest, and invasions by Germanic tribes.
Step-by-step explanation:
The western Roman empire finally collapsed due to a combination of internal and external factors. Internally, the empire faced political instability, economic decline, and social unrest. Externally, they faced invasions from Germanic tribes such as the Visigoths and Vandals. These factors weakened the empire to a point where it could no longer maintain control over its vast territories and eventually led to its downfall.
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