The US has always got the dollar-as-global-reserve-currency out of its military spending, which is a large part of how post second world war America accrued a huge portion of unearned global wealth. Trump, those that voted for him, and those that spent decades creating this situation for personal enrichment are rapidly hastening the end of this situation.

There are always best and worst case scenarios.

We are currently comprehensively losing the battle for 3C@2100 (which comes with increasingly harmful-to-devastating impacts in the intervening years and decades: future climate refugees will make the current not-far-off-a-London a decade seem like a picnic. A situation fascists will no doubt exploit).

It looks like the only way to prevent 4C plus and, a future Earth only described in science fiction, is mass civil disobedience.

But the UK government appears to be the worst in any civilised country in terms of squashing dissent, and most of the public appears to be more concerned with not being delayed on their commutes.