The USA has ancient Rome's problems. We are spread so thin around the world in service of defending free trade via the Bretton Woods system, that we now have decades worth of foreign investments that have taken on lives of their own based on geography. Our politicians are bribed and blackmailed from entities on every continent. These elements have thoroughly penetrated the Republic since WW2, and then of course we have our problems from the decades before WW2. Globalism is dead, and unlimited growth has now reached its limit. If you view the world from the 1890s, then current events says that the world will revert to that global model of regionally dominant powers. The USA is withdrawing from defending global trade routes for free. Trillions of dollars in assets priced in the US dollar at risk, and so, the chaos of nations finding safe havens for investment yields the acting out in desperation. Internationally, power is devolving from all centralized regimes to the local level, as that is the accelerating trend in global supply chains. The bright side is that, as bad as things will get for us during this withdrawal, the rest of the world is ill equipped to transition as fast as we can. Of all the major economies, we rely the least on selling our goods via these routes.
The world faces demographic collapse also, which makes the losses in war even more costly. We have every advantage. Biden is supported by those who wish to save this former global order, but even if he wins, it's doomed to fail regardless. Geography will matter again, and we are in a prime position to pull back, regroup, and watch the world beg us on bleeding knees for assistance. It's a matter of leverage and patience. Any nation cut off from the US dollar is royally screwed.