Russia, China, Iran, or some other country?
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Iran would be another Iraq for the US. So regardless of what the 20 year outcome of the hypothetical Iran-US war was, the current political party in charge of Iran would be dead and the installed US puppet government would be considered illegitimate by all the other political sects.
Russia and China would win on their home turf, and get absolutely destroyed in all possible ways if they tried to invade the US in this ridiculous Tom Clancy scenario the OP has concocted.
Russia, because every time you crack a Russian defence fortification it turns out there is another, smaller one inside
Russia can’t even win against Ukraine.
I have some bad news for you about the current condition and borders of Ukraine
Overextend, turn your enemy into insurgents, attempt to kill every one
over tenof the “military aged males”, cause a global financial crisis, as a million people die due to your shit pandemic handling pull-outThe US is worse than Ukraine. They send their vassals to death without a second thought but with an inevitable betrayal. Yet if they ever fought a war in their own land for once, they’d quickly lose the will and ability to fight.
Given their track record, any guerilla military force with a few assault rifles, apparently.
The honest answer is China, but I would hope the US crumbles from within before it ever comes to that. While I have no doubt that the US would be crushed, I also have no doubt that the loss of life (nevermind the environmental fallout) would set humanity back decades. That’s assuming the US didn’t resort to nuclear weapons as a last gasp.
