You’re right about the US’s military, but you know who also had an outstanding military? Almost all (now dead) empires. I think it stretches exceptionalism beyond all credibility to think the US will buck this trend. That the US empire will be thought of in the past tense is pretty much inevitable, I’m most worried about how it goes. Will it be with a bang, or a whimper. I fearful of the former as they can mount a pretty big bang.
Trump’s vision is so myopic that he can’t see beyond his own nose. Same for is ability to care. If the US reneges on promises made as detailed in the Budapest Memorandum what chance will they have in other such promises. Countries are watching. This is doubly ironic as Trump keeps talking about nuclear war.