US empire collapse does not mean the end of USA as a relatively wealthy nation. If played correctly it could mean retrenching into the role of a regional power which is exactly what Trumps moves so far look like...becoming a regional hegemony across the Americas stretching from Latin America to Greenland. China will increase its sphere of influence across Africa, Middle East, Asia and elsewhere. Russia and Iran are already dependent upon Chinese trade and Chinese trade payments provision. Europe will fend for itself and be increasingly dependent upon China. All nations are now reliant upon Chinese supply chains. China has won the trade war but US can salvage some of its declining position and this appears to be Trumps strategy. Just as the UK preserved some of its wealth and power as its decline occurred it is not impossible for the USA to do the same or similar. Trumps 'crypto' policies could be seen as analogous to Britains use of offshore tax havens to preserve wealth advantage ~ at least for wealthy Brits.