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>The US is incapable of suffering a fall of Rome. America's geography makes that impossible.

That’s true if you look at America’s rivals on the world stage, i.e. Russia or China. But Rome wasn’t sacked by the Persians, or the Egyptians, or another Great Power of the time. It was sacked by tribal Gauls and migrating tribes of Visigoths.

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By that time, the gauls and the visigoths had gotten to be a greater military force than the romans. A few hundred years of battle against the romans had allowed the germanic barbarians to organize and weaponize to parity and beyond. Not too long after, the huns arrived and proved to be even more powerful and that pretty much ended the roman empire. For the last decades, the romans were pretty much paying the germanic tribes and the huns to stay away from rome.

Certainly the germanic tribes as a whole can be considered a local "great power" and the huns certainly qualify as a great power.

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