I mean no disrespect, but if you're seeing a deep parallel between the Roman Empire's final days and what's going on in the US today, I would say you need to study Roman history more. It was in deep chaos that most people in the world today can't even imagine.
The Empire was relentlessly invaded by tribes like the Visigoths and the Vandals, and they even sacked Rome multiple times in the 400s CE. There was a huge amount of political corruption, and no, I don't mean anything like what's going on in the US. Military leaders and royal guards fought each other for power, leading to frequent civil wars and leaders who didn't last long. No one wanted to join the military and so it had to hire foreign mercenaries who didn't really have any loyalty. The Roman Empire eventually split right in half because a single ruler could not project power over the entire territory. The Western Roman Empire spoke an entirely different language from the Eastern Roman Empire (Latin vs Greek)!
I'm sorry, but I keep hearing these comparisons from people who seem to have a very shallow understanding of history and are looking for patterns because they read online that the US is crumbling. Maybe, maybe not, but it is not the same thing or even similar. The differences are far more than the similarities.
A better parallel is the fall of the republic with the rise of strong men using populism and power to dismantle its form of democracy in favor of authoritarianism.
The Romans pretty much had their way (peak) for 300 years. Yes decline was not instantaneous, but no one can complain about having 300 years of relative success/dominance, which they did once they defeated the Carthaginians all the way to about 200 A.D.
The Romans pretty much had their way. Their decline happened pretty much in the same way all civilizations end the elite’s participation in defending the empire or their civilization became less and less in short decadence sound familiar? Arguably the Civil War was probably the last war where the largest percentage of the elite actually participated in fighting the war and that percentage has gone down in every war since.
The United States from its founding until about 1990 had its way but now the shine appears to be coming off slowly. The way it currently looks 2100 is probably going to have a new number 1.