I don't think there will be a full on collapse, because there is still underlying value in US (especially places like California that have GDP higher than some countries).

But long term degradation of economy absolutely.

Larger than all but 2 other countries. https://www.businessinsider.com/california-economy-fourth-la...

Extra History's Bronze Age Collapse series is a good watch right now:

https://www.youtube.com/watch?v=KkMP328eU5Q

And for more spectacular (and not so spectacular) collapses, check out Fall of Civilizations[0]

[0] https://www.youtube.com/@FallofCivilizations