Sometimes this question sneaks up to me like an intrusive thought, but recent events have made me give this question a lot more consideration.
"Comply with us, or we will kidnap your leader, bomb and occupy your land. Resist further and we will use nuclear weapons."
They have no need to dress their words in the clothes of decency and legality. They hold the power and technology to force anyone to comply, even if a country had nuclear weapons too such factor would only become relevant if the country had a nuclear triad and a stockpile over 2 digits.
Operation Northwoods and September 11th prove that the leadership of the U.S. would gladly welcome violence on Americans if it can be used as justification for further violence against enemies of the state, combine that with the knowledge that the leadership of the U.S. is the only one in the world that has proven itself capable of using nuclear weapons on civilians. They are bandits unshackled by morality, humanity or consequences.
There would be no international consequences, there is no collective of states in the world strong enough and willing to challenge the U.S. if it started making demands backed by the threat of nuclear bombardment.
There would be no domestic consequences, the U.S. has the most obedient population in the world as well as the world's most advanced police state.
So, what is stopping the U.S. from holding the world hostage with a nuclear gun?
Venezuela, Cuba, Mexico, Brazil. It could start annexing all of the Western Hemisphere tomorrow as enslaved resource colonies and the world couldn't stop them. It could force every country in the world except Russia and China to pay half their economy as tribute to keep American capitalism going for another 200 years and all it would need to do so is the threat of carpet bombing and nuclear terrorism.
The rate of profit will continue to fall either way, capitalism is inherently unsustainable, it will cease to exist no matter if it takes 50 years or 300. But in the short term I see it as a looming possibility that the administration of the U.S. will drop all pretenses and just take what they want whenever they want, backing their threats with nuclear weapons as it desperately seeks more resources to plunder, like a dying vampire thirsting for blood.
This is also a mentality barrier. As long as we allow them to wield that threat over the world, they will never stop. The nukes aren't going away, and at some point "death to Amerikkka... unless they have nukes in which case Amerikkka can do whatever they want to anyone anywhere" will have to become "no, really, just death to Amerikkka."
There is this idea that we just accept that any kind of nuclear confrontation will result in a chain reaction that destroys the world. That's possible, yes, and terrifying. But is it the only possible outcome? Could an existential threat wake the US the fuck up and remind it that it can die just like everyone else? It seems like that's what's missing right now. The US sees itself as untouchable because it is, no one is willing to try to fight back, and as long as it continues to believe that, it will continue to bully and subjugate the entire world.
Would Pete Hegseth and the other devils behave this way if there was a real, serious risk of them and their families being vaporised in an instant? Would their billionaire masters risk it? I think they might think twice, but no one actually has the guts and they know it and it emboldens them.
You touch fire, you get burned, then you learn not to touch fire.
If there are no consequences for the U.S., they'll just keep doing it over and over and over again. Something needs to hit them hard, but no one is able or willing to do it.