Answer:
The event that marked the end of the Western Roman Empire was that the Germanic leader Odoacer seize control of Rome.
Step-by-step explanation:
The fall of the Western Roman Empire was a process of gradual disintegration that took place from about the 3rd to the 6th century, but often dates back to September 4, 476. On that day, the last (but already illegitimate) emperor Romulus Augustus was forced to abdicate by the Germanic leader Odoacer, who subsequently seized the territory of Italy.
This was preceded by two centuries in which the emperors lost their grip on more and more areas, the empire had already been plundered by various peoples and the Germans and Visigoths had already put several puppet emperors on the throne.