Which example best describes an external factor that causes the end of an empire

Answer 1

One example of an external factor that causes the end of an empire is the invasion of foreign forces. This can be seen in the case of the Roman Empire's decline and fall. In the 5th century, the empire faced invasions from various Germanic tribes such as the Visigoths, Ostrogoths, Vandals, and later the Huns under Attila. These invasions weakened the empire's military and resources, leading to the ultimate collapse of the Western Roman Empire in 476 AD.