Did I say they solve US collapse? No I did not. They do however probably stave it off- ie delay the day of reckoning. They do provide significant short term revenue- tariffs of 20-25% on imports from your three largest trade partners is a substantial revenue grab. Yes they increase cost to consumers thus reducing consumption especially of imported goods thus reducing the trade deficit and thus the need to increase debt. They prop up uncompetitive US businesses in the short term increasing or preserving domestic production. They recognise that for too long the US has consumed more than it produces and that has resulted in unsustainable debt. They stave off insolvency. China and other major buyers of US Treasuries like Saudi Arabia are moving away from them and instead investing in gold and productive infrastructure. China already conducts major trade in oil and gas with Iran and Russia with its own alternative trade payment settlement protocols outside of USD/SWIFT so yes Trumps tariffs will probably counter productively accelerate this trend away from USD denominated trade. Trumps tariffs attempt to address the woeful state of US competitiveness and decades of chronic trade deficits- but it is unlikely what he is doing will reverse the decline- just perhaps delay the consequences- collapse of the USD/empire.