The western Roman empire finally collapsed due to "attacks by Germanic tribes."
This is evildent in that around 300 AD, the Germanic tribes, often labeled as Barbarian tribes, constantly attacked the Roman Empire.
By the end of 476 AD, the Germanic tribes under the leader of leader Odoacer finally sacked Emperor Romulus Augustulus, the last Emperor of the Western Roman Empire.
Hence, in this case, it is concluded that the Germanic tribes are the main cause that led to the fall of the Western Roman Empire.
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