When the bully gets too ambitious the large number of bullied gang together for revenge, or at least effective countermeasures. The world will route around USA, find they can manage ok without it. The USA will be iced out, lose its reserve currency status, nobody will buy its military technology, making the USA unable to recoup large outlays for ambitious military projects, and the USA will lose its military dominance.
Also, the future of warfare and terrorism is autonomous networks of drones. Mexico and Canada won't be disposed to care what passes through their borders with the USA, and like Zelensky said ... we had the oceans and friendly neighbors, but that won't help us anymore.
The USA may get the metric system out of this. The only reason the USA can hang on to its ridiculous "imperial" units has been its economically dominant position.
Also, the future of warfare and terrorism is autonomous networks of drones. Mexico and Canada won't be disposed to care what passes through their borders with the USA, and like Zelensky said ... we had the oceans and friendly neighbors, but that won't help us anymore.
EDIT: minor corrections