Final answer:
The phrase indicates the decline of Roman power due to internal and external threats.
Explanation:
'There is no one left to fight' signifies the decline of power of the Roman Empire. This phrase reflects how the Roman Empire faced challenges from barbarian groups who became more organized and formidable, eventually leading to the fragmentation of the western Empire.
During its peak, the Roman Empire, known for the Pax Romana, spanned vast territories, but internal struggles and external threats weakened its grip over time.
As the Empire faced escalating barbarian invasions and internal strife, the inability to defend itself and maintain control over its vast domains showcased the diminishing power of the once mighty Roman Empire.
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