US government solvency is backed by the power to tax and tap into the massive US economy.

Considering the US has one of the lower overall tax rates of developed economies, I’m not sure we’ve reached any sort of crisis level

This is the truest and most impactful point so far on this thread. Rescinding the Trump I tax cut (IIRC technically the permanent extension of a temporary tax cut) would fix a lot of problems. That and not being belligerent to our creditors gets you pretty close to a complete solution.